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@swayback_sultan ·

Horizontal folds pool just under the waistband at the back on everything I make — what adjustment is that actually?

Trousers, skirts, fitted dresses — all of them do the same thing. A few centimetres below the waistband at centre back there is a horizontal fold of excess fabric that will not press out and is not there when I hold the fabric up.

The front is fine. The waist measurement is right. Side seams hang straight. It is specifically a horizontal pool at the back, and it is in every pattern regardless of brand.

I have tried taking in the centre back seam, which pulls the whole thing sideways and makes the side seams swing forward. I have tried going down a size, which makes the waist too tight.

Since it happens on everything, I assume this is a known adjustment with a name that I do not know. What is it, and where in the process am I supposed to fix it?

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  • @shorten_the_back · 3h ago
    @shorten_the_back ·

    That is a sway back adjustment, and you have the right instinct — it is a known thing with a name, it happens on every pattern, and it is not a size problem.

    What it is. Patterns are drafted for a back that is a certain length from waist to hip. If your lower back curves in more than the draft assumes, the pattern's centre back is longer than the distance it has to cover. The extra length has nowhere to go, so it folds. That is why it appears in the same place on everything and why holding the fabric up makes it vanish — you are taking up the excess with your hand.

    Why your two attempts made it worse. Taking in the centre back seam removes width, and you do not have too much width, you have too much length. Removing width from centre back also rotates the whole garment, which is exactly the side seams swinging forward that you saw. Going down a size removes width everywhere, which is why the waist got tight.

    The fix is to remove length from the centre back only, tapering to nothing at the side seam. On the pattern piece, draw a horizontal line from centre back to side seam a few centimetres below the waist, and fold out a wedge that is your excess at centre back and zero at the side. Everything else keeps its measurements.

    Start with a centimetre and a half. Most people need somewhere between one and three, and it is much easier to take out more than to put it back.

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  • @pattern_before_cut · 3h ago
    @pattern_before_cut ·

    The important half of the answer above is where you do it: on the paper, before cutting. Doing it on the garment is possible and it is a worse repair every time.

    If you fix it after the fact, you are taking a wedge out of a seam that already has a waistband attached and a zip in it, so you end up with a waistband that no longer matches the garment and a centre back seam with a curve in it that fights the zip. That is the version people try, hate, and conclude the adjustment does not work.

    On the paper it is one fold and a redrawn seam line, and everything downstream comes out right.

    Two things to watch after the wedge is folded out:

    Redraw the centre back seam smooth. Folding out a wedge leaves a step or an angle at centre back. Blend it into a clean line or you will see exactly that angle in the finished garment.

    Check the darts. They usually sit in the region you just shortened, and they may now be too long for the space. Shortening them by the same amount you removed keeps the point where it was relative to your body.

    Once you have the number, it is yours. Write it on a card and apply it to every pattern you cut from now on — that is the actual payoff, because this is a body thing rather than a pattern thing and it will be the same on all of them.

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