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A Tip for Fitting the Back Crotch Curve | Video

Fitting expert Sarah Veblen focuses on resolving one of the most common fitting problems in pants—the back crotch curve.

Fitting expert Sarah Veblen focuses on resolving one of the most common fitting problems in pants—the back crotch curve. Frequently, this seam is too short and insufficiently curved to fit the body.

When fitting a muslin on the body, the back crotch curve is difficult to reach. Sarah shows an ingenious method for working on this area of the pants, so you can reshape the seam to provide enough space for the derriere and to eliminate excess fabric that often bunches under the seat.

Other videos in this series:

Introduction to Pants Fitting

Pants Patterns Compared

Pants Fitting, Example 1

Pants Fitting, Example 2 | Video

Choose the Best Size for Fitting a Muslin | Video


About This Video Series

Many women find it difficult to fit pants for a flattering, comfortable look. In this video series, fit expert Sarah Veblen shares her method for fitting a slacks-style test garment, which can then be used as a master pattern for nearly any pants style you prefer. Sarah explains the benefits of her method, shows how to select an appropriate pattern shape and style to fit, and how to choose the right starting size. She then…

More About this Video Series


  1. user-6876651 | | #1

    Wow, that was really enlightening. You can actually SEE the adjustment work, and it really makes sense. Thank you, Sarah!

  2. user-7055095 | | #2

    This is amazing. It is the best fitting tip I have ever found; it works, you can do it on your own, back and front!

  3. akrunrgrl | | #3

    Agreed! Astonishingly helpful...thank you so much, Sarah.

  4. user-7458871 | | #4

    I am amazed at being able to actually watch the pants start to fit better.
    But what about when making pants for yourself? You can't be clipping and wearing at the same time.

  5. carolfresia | | #5

    Hi, user-7458871,
    It is tricky to do this on yourself, though you can do some on-and-off clipping if you're patient. It's a better idea to find a sewing friend, or anyone you trust with a pair of scissors, to clip cautiously while you check the results in a mirror to see when the correct fit has been achieved. Have her/him watch the video first so she/he knows what to do--it's a little tough to describe what's happening!
    Many of us know we need to "scoop" the back crotch curve to remove the crumpling fabric under the seat, but on the pattern you'll never know exactly how much or what shape of a scoop is required. This method works because it shows you what kind of scoop you need as you do it.

  6. Bill_Columbus_Ohio | | #6

    Incredible. She is so talented and experienced. Additionally, her photo-based book on pattern fitting is TERRIFIC! It makes the sewist much more observant on how clothes fit. Thank you. This instruction and insight justifies my Threads subscription alone.

  7. annette83 | | #7

    Thank you so much for this video, it was great to see how the clips improved the fit. Photos only go so far.
    I was still having problems though with fabric from the back of the legs being pulled to the front looked so much like the crotch curve wasn’t right, but it wasn’t tight at all. I then realized after looking at the grainline and the way that the fabric pulled that I needed to release the inside seam.
    Now I just need my partner to help take in the outside seam and maybe add some extra fabric to the inside seam while keeping the grainline straight. Doing that would be rather tricky without him I think.
    Oh the fun of drafting your own pants pattern.

  8. catstexas | | #8

    Wow is all I can say. I’ve used Sarah’s pants fitting techniques for years, but I was never happy with my freehand scooping of the back crotch. Can’t wait to make a muslin and use this approach. Thanks Sarah, you’re a genius.

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