Why denim is forgiving, and cutting it down
Okay. New module. We're done fixing the machine and now we're going to make it earn its keep.
We're starting with denim, and I want to tell you why before we cut a single thing.
Everybody walks in here scared of denim and relaxed about knits. That's backwards. Denim is a woven fabric with a tight, stable structure. It doesn't stretch on you, it doesn't curl at the edges, it doesn't slide around under the presser foot while you're trying to keep a straight line. It sits there and lets you sew it. Knits are the ones that'll humble you, and we'll get to that fight later in the course. Denim is not the enemy. Denim is the fabric that forgives you while you're still learning where your seam allowance actually is.
Here's what "forgiving" means in practice. If your line wobbles a little, denim doesn't show it the way a thin cotton would. If you have to unpick a seam, the weave holds together and doesn't fray into a mess the second you touch it. If you press it wrong, you get a second chance, it doesn't scorch and shine like some synthetics do. It's honest fabric. It tells you what's wrong with your stitch instead of hiding it, and it doesn't punish you for a shaky first attempt.
That said. Denim is thick, and thick means a few real things you need to respect, not just a pep talk.
What you're actually working with
Depending on the weight, you're sewing through two, four, sometimes six layers where seams cross, like at a hem or a flat-felled seam. Your regular needle from lessons past is not built for that. Use a denim or jeans needle, the ones with the reinforced shaft, and use a fresh one. You already know I'll say this every module, I'm not going to stop.
Pins matter more here, not less. A dull pin on thick denim will bend before it goes through, and you'll be tempted to skip pinning because it's a hassle. Don't. Pinning is not optional and I don't care that it's slower on stiff fabric. The five minutes you save skipping pins, you pay back double when your cut line drifts and you've wasted good denim you already killed a pair of jeans to get.
And go slow over the thick spots. Inseams, waistbands, back pockets. If your machine has a hand wheel, use it to walk the needle through the bulky part instead of flooring the pedal and hoping. A needle that snaps on a thick seam is a normal Tuesday for anyone cutting up jeans, it's not you doing something wrong, it's just what happens when you rush the thick part.
Cutting it down, step by step
- Wash and dry the jeans first, always, even if they look clean. Denim shrinks and the dye bleeds the first few washes. You want that done before you cut, not after you've sewn something and it comes out a different size than you planned.
- Lay them flat and decide what you're actually salvaging. Waistband, pockets, the flat panels of the legs, the flat-felled seams themselves if you want a design detail. Look at where the fabric's actually worn. Mine always goes at the thigh, never the knee, so I know to cut around that spot and use the good fabric above and below it.
- Cut along the existing seams first, don't just start hacking into the middle of a leg. Take the side seam and inseam apart with a seam ripper where you can, you'll get bigger clean panels that way instead of small odd shapes.
- Press what you've cut. Denim holds a crease well, which is good news later, but right now it means press it flat before you measure anything on it, or you'll cut crooked without realizing it.
- Measure twice on your pattern piece, whatever you're making, a bag panel, a patch, a pocket. I mean this one literally, not as a saying. Denim doesn't stretch to bail you out if you're a half inch short.
This is where I'll tell you the fabric store thing. Years ago I drove forty minutes past the closer fabric store because the reviews said the staff were short with people and the flannel was thin. I didn't believe it, I went anyway, further out, because the reviews there were better. They were right both times. The closer store had thin flannel and staff who acted like I was bothering them. I still think about that every time somebody tells me to just go to the closer place. Sometimes the extra twenty minutes is the whole difference between fabric that behaves and fabric that fights you the whole project. Same goes for a good pair of dead jeans versus a thin, worn-out pair, by the way, look at what you're cutting before you commit to it.
Once you've got panels cut, don't sew a stress point, like a bag handle or a strap, with just a couple stitches and a knot. Backstitch those, they take the load. But a plain seam on a patch or something decorative, forward stitches and a knot is fine, save the backstitching for where it's actually earning its keep.
Before next time
Bring in one pair of dead jeans, thigh holes and all, washed and dried. We're cutting panels next lesson and I want you to already know which parts you're keeping.