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Top Down, Center Out: Practical Pants Fitting

Try this logical and practical method
Threads #218, Summer 2022

Fitting a pants pattern often takes a familiar pathway: You enthusiastically begin with a sewn mock-up. You evaluate the muslin and decide on needed alterations. In the next round of fitting, a different issue emerges and you correct for that. But instead of showing steady improvement, the fit may be even less satisfactory on a subsequent round. You’re on a frustrating downward spiral of pants fitting. Every fix has unintended consequences that affect another part of the pants.

A sensible approach

I’ve developed a fitting method I call Top Down, Center Out (#TopDownCenterOut), a holistic, body-neutral approach that takes you from pattern to garment with only one muslin test garment, or toile. As the name suggests, you’ll start at the top—the waistband—to set the crotch seam position, and then fit outward, working from the center out to the side seams.

This method is incredibly simple and realistic to execute solo. It makes pants fitting accessible for novice sewers and streamlines the process for established sewers. It makes it possible to fit any body shape in any pattern.

fitting pants with a one-legged toile
Fitting pants with a one-legged toile makes it easier to get the proper fit through the crotch seam, and then to resolve circumferential issues. Plus, you can do this on your own—no fitting buddy needed.

Fundamentals of fit

The most important principle in pants fitting is to respect the fabric grain, so the finished garment reflects the intended design. A lot of pants-fitting advice fails because, while it may smooth the silhouette and remove excess wrinkles, it ends up sacrificing the design in order to fit the body.

Accuracy and precision are also important. Pants must allow ease for body movement but also keep the ease correctly distributed around the torso and legs. Even a small amount…

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  1. user-7887460 | | #1

    So refreshing to see a bit of out-of the-box thinking on this topic! Got to try it!

  2. VeraS | | #2

    No horizontal or vertical balance lines? All the adjusting and moving of fabric to create the perfect toile may skew the grainline if there's no reference point as to how the fabric has been moved, won't it? Perhaps I missed the part about adding HBLs & VBLs. I'll re-read the article to make sure I didn't miss anything.

    1. Elayssa | | #5

      I had the same thought and wondered if using a balanced stripe or gingham fabric (weaved that way not printed) might solve that issue if used for the toile.

  3. JuneBV | | #3

    This seems quite easy and
    I'm always open to new ideas but there is no mention on how and when to adjust the rise. Am I missing something?

    1. user-7759868 | | #4

      I believe the waistband placement will determine your rise. Then moving the pant up or down to get the crotch placement correct. This is why she has us adding 2" to the top of the pant waist seam, to have enough to play with. This really seems like the most efficient way to fit that I've ever seen. Thank you Ruth and Threads!

  4. user-7863167 | | #6

    This is so practical - and intuitive. The problem for most of us is that our bodies don't follow smooth volume lines like a ellipse, sphere or a cylinder and the transitions/proportions between those basic forms vary widely along the surface of the body. This method takes all of that into account along with how a fabric drapes across uneven surfaces. That is the key to a great fit that enhances a figure rather than pulling at an unusual transition point or exaggerating volume to cover up a difficult transition. And the waistband is so important to fit first like the shoulder line on a bodice - it creates a base for the vertical drape. I can't wait to try this method.

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