Sewing · Fit · Trousers
Sewing trousers in corduroy, denim & co.: adjusting the pattern for firm fabrics
You've sewn a pair of linen trousers, they fit perfectly, and now you want to make them in corduroy or denim? Then you're often in for a surprise: the same trousers suddenly feel tight, the waistband slips down at the back and folds appear below the bottom. Here you'll learn why this happens and how to adjust your pattern step by step for firm, heavy fabrics. I'm using my Limfjord chinos as an example.
Background
Which fabrics count as firm and heavy?
This means woven fabrics that are dense and sturdy and barely give, for example:
- Corduroy, i.e. needlecord, babycord or wide-wale cord
- Denim and jeans fabric
- Cotton twill, chino fabric and gabardine
- Canvas and sailcloth
- Moleskin and velvet
- Wool fabrics such as flannel, tweed or loden
Why
Why the same trousers fit differently in a firm fabric
Every pattern is a little wider than your body. This ease determines how loosely the trousers fit. On slim, tapered trousers like Limfjord, it is deliberately small at the seat and thighs:
| Size 38 | Body measurement | Finished measurement | Ease |
|---|---|---|---|
| Hip | 97 cm | 105 cm | +8 cm |
| Thigh | 58.5 cm | 61.5 cm | +3 cm |
Linen gives a little because of its weave, so that's enough. With firm, heavy fabrics, two things come into play:
- Fabric thickness: thick fabric, pile and bulky seam allowances take up space on the inside. The trousers end up tighter than the pattern measurements suggest.
- Weight: heavy fabric doesn't drape softly over the body – it stands away and pulls downwards. If length is missing at the back, the waistband slips down even more noticeably.
A few percent of elastane helps a little, but doesn't make up for the missing width.
Step 1
Cut one size larger
Cut the front, back and waistband one size larger than you would for linen. This gives you the width at the hip and thigh that the thick fabric needs. For trousers with an elastic waistband, still cut the elastic to your actual size. It gathers the slightly wider waistband in to your waist.
Step 2
Lengthen the back rise
If the waistband sits too low at the back and slopes backwards when seen from the side, length is missing at the back. You add this length at the centre back only. The side seam and the front stay unchanged.
- Put on your test trousers and measure how much length is missing at the centre back to reach the right waistband height. It is usually 2–3 cm.
- Cut the back piece horizontally below the back pocket, from the centre back to the stitching line of the side seam. The seam allowance at the side seam stays intact.
- Swing the upper part up at the pivot point until the centre back opens by your measurement, and tape paper underneath.
- Redraw the centre back as a straight line until it blends into the crotch curve. True up the top edge at the centre back at a right angle.
Step 3
Sew a toile and check the fit
If possible, sew the toile from a fabric similar to your final fabric. A test fabric without stretch always fits tighter than a fabric with stretch.
| What you see | What you do |
|---|---|
| The waistband sits level at the back. | It fits – no further changes. |
| There is too much width at the front or sides. | Pin out the excess at the side seam and transfer it evenly to the front and back. |
| The waistband still slopes down at the back. | Lengthen the centre back again by the missing amount. |
| Diagonal folds run from below the bottom towards the inner thighs. | Extend the back crotch point, see step 4. |
Step 4 · only if needed
Extend the back crotch point
If diagonal folds remain below the bottom, the seat needs more room in the crotch at the back. Extend the crotch point of the back piece by 0.5–1 cm. Draw the crotch curve smoothly to the new point and blend the inside leg seam to about knee height. Leave the front unchanged.
Sewing tips
Tips for sewing firm, heavy fabrics
Waistband with a facing in a thin fabric: a waistband made from a double layer of heavy fabric with elastic inside becomes very bulky. Split the waistband at the fold line and add 1.5 cm seam allowance to both halves. Cut the outer waistband from your main fabric and the inner waistband from thin cotton.
- Pocket bags: cut them from thin cotton or lining, not from the main fabric.
- Seam allowances at intersections, for example at the crotch seam, should be trimmed to about 0.7 cm. That way the seam is less bulky.
- Nap direction for corduroy, velvet and moleskin: lay all pieces in the same direction, otherwise they will shimmer in different shades.
- Pressing: press pile fabrics such as corduroy and velvet only from the wrong side with a towel underneath. Press wool fabrics with a damp cloth.
- Hem: finish the edge and turn it up only once, not twice.
- Needle: use a jeans needle (size 90–100, for canvas and denim also 100–110) and a slightly longer stitch length (3 mm).
To take away
Everything as a PDF and the matching pattern
You'll find all the steps with drawings in the free Limfjord fitting guide (in German). The Limfjord sewing pattern is a relaxed women's chino in sizes EU 30–60. In the sewing video (in German) I show you the whole pair of trousers step by step.
Download the fitting guide (PDF, German)View the Limfjord patternWatch the Limfjord sewing video
With these changes, your trousers will fit just as well in corduroy, denim or wool as they do in linen. If you're unsure, feel free to send me photos of your toile from the front, side and back to mail@seamone.de.
Simo
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