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A Primer on Sewing Knits

Knits give you great leeway when fitting and are very comfortable to wear.
Knits give you great leeway when fitting and are very comfortable to wear.

Knits give you great leeway when fitting and are very comfortable to wear.

by Ann Person
from Threads #73, pp. 42-45

Let me quickly dispel the apparent mystery about sewing with knits: there isn't any! Nonetheless, after 30 years of writing and teaching on the subject, I'm always surprised to find out that these supple fabrics still alarm many sewers. And nowadays there are so many new knit fabrics available, it's hard to know how to handle them all. So I'd like to present a basic primer of information every sewer needs to create knit garments that look like ready-to-wear. And believe me, it's easy— you don't have to be an expert.

The great fun of sewing with knits is the leeway they give you when fitting. A garment made from a stretchy fabric doesn't have to fit as perfectly as one made from a woven, so knits eliminate the pressure of exact measuring and altering of patterns. And they're so comfortable to wear!

When constructing knit garments, the first rule is that if the fabric stretches, the seams must stretch, too, so that the stitching won't pop as you bend and move in the garment. Whatever type of machine you have, I'll show you how you can achieve flat, stretchy seams.

Knit fabric sampler
Select patterns designed for knits when you sew these forgiving fabrics, available in an amazing variety of weaves, prints, and blends (including printed cotton interlock (1), silky rayon/metallic (2), mohair/wool jersey (3), striped acetate rib (4), and lacy linen/nylon jersey (5)).

Check out the fabrics!

Whether made of cotton, wool, linen, one of the new synthetics, or a blend, each knit falls into one of several construction categories: single knits (created on a commercial knitting machine with a single bed of needles); double knits (created on a double-bed machine with two back-to-back beds of needles); and rib knits (made by alternating stitches between two needle beds). Single-knit fabrics like jersey, velour, terry, and fleece look different on the reverse side, have cut edges that curl, and usually have about 25-percent stretch. Double knits like interlock (made with fine yarns) tend to be more stable than single knits, often look the same on both sides, have cut edges that don't curl, and stretch from 25 to 75 percent, depending on the fiber and construction. Rib knits, constructed from alternating knit and purl stitches in various combinations, may look the same or different on opposite sides, tend not to curl, and have up to 100-percent stretch.

My philosophy for fabric preparation is to always pretreat a fabric before you sew it exactly as you plan to care for the finished garment. This means that cotton, linen, and synthetic knits should be washed and dried (in the dryer if you plan to dry them this way later), and wool knits should be thoroughly steamed before cutting.

Smart pattern choices
When planning a knit garment, I recommend selecting a pattern specifically designed for knits, rather than for woven fabrics, because the pattern will have the correct amount of ease built into it. The amount of stretch in the fabric will determine the style and size pattern you choose. Check the pattern envelope for suggested fabrics and the amount of stretch required for the style. If you choose a fabric with less stretch, you'll need to add more ease.

Since knit fabric has built-in ease, you don't need as much ease in the pattern as you would for a woven fabric. A couple of inches of bust ease, for example, is plenty for a fairly fitted knit style, compared with the 5 in. of bust ease needed for many woven garments. And a double-knit skirt hangs nicely with 2 in. of ease, while a woven skirt would require at least 3 to 4 in.

Construction options
You can get successful results on knits whether you own a basic sewing machine or the latest high-tech serger. I began sewing on knits long before I owned a serger, and I still recommend my original technique of sewing with a long straight stitch of 9 sts/in. (3 mm), stretching the seam as I sew it (as much as the fabric stretches easily) to add elasticity. When the seam returns to its normal length, the stitches are closer together and the upper and lower thread tensions have loosened. As for using zigzag or stretch stitches to construct seams, I've simply never liked them.

For double knits that will stay pressed open, use a 5/8-in.-wide seam allowance. For single knits that tend to curl, I recommend a 1/4-in.-wide seam, which you can finish two ways: either press it to one side and topstitch for a professional look, or sew a second line of stitching 1/8 in. from the first and then press to one side. The double-sewn seam adds strength and helps keep the seam flat.

If you have a serger, you'll find serging a quick way to assemble knits with a finished, factory look, and the seams will have built-in elasticity, so you don't need to stretch them as you sew. Make sure your stitch is balanced, adjusting the thread tension so that the stitch doesn't bind or ruffle the seam. If your serger has differential feed, raise the setting if your test seam looks wavy. For hemming soft knits, I find that serging the edge, turning up a 1/4-in. hem, and topstitching twice gives a stable, nonslippery finish.

Knits Wovens
Knits ravel or run only from horizontal cut edge, so edges generally require no finishing.   Wovens ravel from any cut edge, so edges require finishing.


Edge finishes— Most knits don't ravel, unlike some woven fabrics— especially loosely woven ones, which can ravel until the seam allowance has vanished. So serging or otherwise finishing seam allowances isn't necessary with knits. Nonetheless, test whether your fabric ravels on a swatch— some silky knits ravel on horizontal cuts, but most cottons and wool knits don't.

You can sew an attractive hem on many knits with double-needle topstitching, the finish that's used most often in ready-to-wear. I prefer a 4-mm-wide double needle and 9 sts/in. for a stretchy, professional-looking hem. For soft, lightweight knits that are difficult to hem, see Fine details for knits.

Miter Corners for a Smooth Finish
by Nancy Snell
When sewing on a thick fabric like fleece knit, a simple, folded hem on corners can end up looking chunky and homemade. Mitering such corners is easy, reduces bulk, and creates a clean, square shape. For more instructions on mitering a hem corner, see Threads #72, p.61.
Miter corners Miter corners
Another type of miter occurs at the corners of the vest's edge "bands," which are really decorative facings stitched and turned to the outside, with 1 in. of outer raw edge allowed to curl (see photos above). Here's how to construct them: Cut facing strips on the crossgrain so that all the outer edges will curl the same way; for a 1-1/2-in.-wide facing, cut strips 1-3/4 in. wide to give a 1/4 in. seam allowance. Cut one end of the adjoining strips on a 45-degree angle and join them right sides together in a 1/4-in. seam, stopping the stitching 1 in. before the end that will be allowed to curl (which is the inner edge of the miter for the front corners and the outer edge of the miter for the armholes). Now sew the right side of the facing strips to the vest's wrong side, turn the facings to the outside, and topstitch 1 in. from the remaining cut edge. The raw edge will curl to cover the stitching.

-Nancy Snell is an expert seamstress in Newtown, CT.

Tips for a cowl-neck tunic
— A cowl-neck tunic is one of the easiest garments you can make from knitted fabric. If you have a jewel-neck knit top pattern that you love, it's easy to convert this style to a tunic with a cowl neckline. To shape the pattern as a tunic, make the body as long as you want and wide enough to flatter your figure at that length, and decide on the length of the vent. To convert the pattern for a cowl neck, lower the neckline as shown below and reshape the side seams to create a hem for the side vents. Cut the cowl the length of the neck seamline plus 1/2 in. for seam allowances, and as wide as you want. For thin fabrics, make it a double layer.

Adapt for a cowl neckline and side vents:
It's easy to change a simple jewel-neck knit top pattern to a cowl-neck tunic with vents.


Lower neck for cowl
Trim neck seam allowance to 1/4 in. Mark 3 in. down from center-front neck edge along fold. At shoulder, mark 1/4 in. in front neck edge. Draw smooth curve from mark at center front to shoulder line. Trim along line. On back, trim 1/4 in from neck edge. Cowl collar is simple rectangle.


Add for vents
On front and back pattern pieces, mark dot along side seamline 9 in. (or desired depth of vent) from finished hemline. Draw extension 1 in. (or desired hem width) past side seamline from 1/2 in. above dot to lower edge.
Cowl neckline and sidevents

So take my advice and don't be afraid to sew with knits. If anything, knits are the easiest of all fabrics to sew!

Fine Details for Knits
by Marcy Tilton
Sometimes knits present a special challenge. Shoulder pads tend to show through on knits, and soft knits often resist smooth hemming. I'll share some tips I use to solve these problems. Cowl neckline and sidevents
A perfect shoulder pad
I've found a petal-shaped, molded shoulder pad that's perfect for everything from T-shirts to a softly tailored, Armani-style jacket and that looks invisible when worn. You can sew the pads into a garment or use hook-and-loop tape.

The key to the pad's smooth shape is a covering of fusible tricot like Sof-Shape by Pellon or Fusi-Knit from HTC, molded and fused into a permanent shape that lasts through washing and dry cleaning. Use this quick process for any raglan shoulder pad. I prefer the petal pads available for three pairs for $10 ppd. from The Sewing Workshop (800-466-1599) and 27th Street Fabrics (2710 Willamette St., Eugene, OR 97405; 541-345-7221).

First, place four layers of interfacing with the stretch lying all the same way. Place a pad on the interfacing with the stretch going across the pad, and cut around it 1 in. from its edge, as shown at top. Fold each piece in half lengthwise and mark with clips at the center. With an air-erasable pen, draw a center line on each piece from top to bottom.

Next, shape a dart on each pad's top cover piece. Place a pad on a tailor's ham, center a cover piece on top, adhesive side up, and fold and pin a dart along the center. Serge or sew the dart, curving it to fit; trim to 1/4 in.

Fuse the top interfacing piece to the pad, sculpting the shape while fusing. Now add the undarted bottom piece, smoothing and pressing to retain the pad's curve.

With the pad upside down, finish the edge by serging, or sew along the edge with a straight stitch and pink 1/4 in. away. Steam the pad to shape and let it dry.

Hem a soft, crushable knit
If you're sewing a soft knit without much body, topstitching the hem, especially with a twin needle, may result in tunneling and rippled edges, since knits stretch more on the crossgrain. My solution is to stabilize the hem with strips of fusible interfacing, which also anchor the hem during stitching. I prefer the results I get with two rows of topstitching rather than twin-needle stitching.

It's easiest to stabilize the hems before assembling the garment. Prepare the hems by pressing them into place (I use an oak-tag template). Cut 1/2-in.-wide strips of soft, all-bias knit fusible interfacing like SofKnit. Sew or serge the right side of a strip to the wrong side of the hem edge (adhesive side is up). After constructing the garment, fold the hem up, fuse it in place, and topstitch from the right side.

-Marcy Tilton of Takilma, OR, teaches at The Sewing Workshop in San Francisco.

Sources for knits

Banksville Designer Fabrics
115 New Canaan Ave. (Rte. 123)
Norwalk, CT 06850
203-846-1333
$10 (refundable) for 36 swatches

Famous Label Swatch Club
1849 Pioneer Pkwy. E
Springfield, OR 97477
541-747-4670
$16/yr. or $4 for mailing of assorted swatches, including many knits

G Street Mail Order Service
12240 Wilkins Ave.
Rockville, MD 20852
800-333-9191
www.gstreetfabrics.com
Free swatches

The Rain Shed
707 NW 11th St.
Corvallis, OR 97330
541-753-8900
www.therainshed.com
$1 per swatch group

Threadwear
1250 Oakley Ave.
Topeka, KS 66604
913-235-1552
800-466-1599
Free swatches

Ann Person of Eugene, OR, is the founder of the Stretch & Sew company of patterns and books.

Fabric photos: Sloan Howard; shoulder pad photo: Scott Phillips; Drawing: Christine Erickson 

ThreadsMagazine Threads Magazine, editor
Posted on Nov 3rd, 2008 in sewing, garment construction, fabric, fundamentals

Comments (11)

user-1109384 user-1109384 writes: I have some 54" wide, fine wool that I would like to make two scarves with, i.e., cut lengthwise. While I plan to create a fringe along the crosswise grain, how should I finish the long, cut edges? Would a tiny, rolled hem work?
Posted: 11:56 am on November 8th

Stacywacy Stacywacy writes: I've had a lot of success sewing knit fabric seams by putting tissue paper under and on top of the fabric as I'm seaming it. Doing this allows me to use a regular sewing machine instead of my serger and it definitely minimizes any tendency to ripple.
I STILL haven't figured out how to successfully sew clear elastic to stabilize a seam though. If anyone has specific instructions for that, I would love to read them!!
Posted: 1:14 pm on August 24th

CBarnesGallagher CBarnesGallagher writes: Ball-point needles successfully have created my seams on jerseys and velours. I found that sharpies may cause problems as I've always tested a sample before proceeding with actual construction. Instructions on needle packages and in machine manuals are specific and reliable about this. Only on woven cloth do I rely on sharpies! The sample fabric is also important to wash-dry testing, as we know. Also, referring to the owner's manual is important to the maintenance of upper- and lower-thread tension. My machine does overcast without fail, and my Brother was much more affordable than others, and I've been maintaining it for about 30 years. I do clean, lube, and adjust it as necessary. I always create the first seam, then turn the garment or linen/curtain around to overcast it. Then, I stitch again .25" away from the seam line to create an easy but reliable French seam, even on all velours and jerseys. For some applications, I do continue to recommend Herringbone stitches, etc. by hand although the process is so consuming that I rely on machine whenever possible. Velours and jerseys are so comfortable.
Posted: 3:17 pm on February 4th

Susiesmom Susiesmom writes: Don't forget one of the premier sources for quality knit fabrics in the country: Christine Jonson (cjpatterns.com). She's a respected designer and author, who's appeared in Threads and many international publications. Her patterns are stellar and her knowledge of knits formidable. She's our favorite source for fabric and patterns here in Michigan.
Posted: 7:55 pm on June 18th

SanMarGnd SanMarGnd writes: To keep your seam from bunching up as you start to sew, do not back stitch. Instead put the feed dog down and sew a couple of stitches in place, then put the feed dog back up and continue to sew the seam. No bunching, you can end the seam the same way.
Posted: 1:26 pm on January 26th

SanMarGnd SanMarGnd writes: Usually what the garment industry uses is the clear elastic. However, whenever I sew the shoulder of a knit garment I simply cut a strip of the same fabric on the lengthwise grain and apply it to the shoulder at the same time as I sew the seam together. I use the serger so the fabric is trimmed at the same time as the shoulder seam. This stabilizes the seam just fine. and is not too bulky.
Posted: 1:21 pm on January 26th

NotMySister NotMySister writes: What do you do to correct the material from bunching up when you start and do a back stitch? I just returned to sewing after years from it and I still haven't figured that out.
Posted: 11:18 am on July 28th

SawaSawa SawaSawa writes: Hi Dembie,
Not sure if this is what you are looking for but I think it is called plastic elastic. It is inexpensive, commonly used in knit garments at shoulder seams to stabilize them. I've seen it at 'Beverly's' and it's probably at other fabric stores... below is a link to it at Beverly's. Below that is a link describing how to sew it into knits.All the best.

http://www.beverlys.com/catalogsearch/result/?q=clear+elastic

http://sewing.patternreview.com/cgi-bin/review/readreview.pl?readreview=1&ID=486


Posted: 9:02 pm on August 31st

AprilO AprilO writes: Thanks for this, I think I might finally overcome my fear of sewing knits. I especially like your trick of using a straight stitch and pulling the fabric, my old Brother Pacesetter has a built-in stretch stitch but it is extremely slow and tedious.

Also --- help! I just bought a kimono dress pattern not realizing that it is for stretch knits only. Can I just add extra ease to the pattern to make it out of woven fabric? If so, how much should I add?



Posted: 5:28 pm on July 13th

miedrn miedrn writes: I believe the "stabilizer" you're talking about can be interchanged with clear elastic that you can use on shoulder seam lines. It's what I use - try it. You can get it at JoAnne Fabrics.

If this isn't suitable, I'm sure someone else will chime in!
Posted: 9:47 am on April 10th

Dembie Dembie writes: I need to alter some knit tops. I am noticing that the shoulder seams have a transparent plastic strip sewn in with the seam. It is not fusible but works excellent as a stablizer to keep the seams from stretching too much.But it can stretch a little.

There are no places to buy sewing supplies here. They went out of business years ago. I can't find an internet supplier of a roll of these strips.

Can buy plenty of patterns and knit material online; but no one mentions these plactic strips even though ready-to-wear seems to have them is almost all their sewn knit tops.

Would love some info. Tks.

Posted: 5:16 pm on March 21st

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