The cuts of fabric are cut with dies. A layer of fabric is place down and a press presses the cutting die down to cut out the shape. A cheap manufacturer over stacks how many sheets are cut at ones. Top layer is going to be bigger then the bottom layer.
I expect there is much more hand cutting going on than you realize. To have multiple styles and different cuts would require giant warehouses of dies. Those aren’t cheap and wouldn’t last long in a production environment. Any change would require a new die. The machine shop would need to be as big as the cut sew shop.
One skilled (or trained) operator can change from pants to shirts on a whim. You’ll notice almost all clothing is made in far off places where labour is cheap. Not to say there isn’t die cut stuff, but overwhelmingly the textile industry is hand made.
These things are how multiple layers of fabric gets cut.
Surprisingly CNC cutting machines are becoming more common even in places where labor is “cheap”. The technology is becoming affordable and reliable enough to replace even underpaid workers as a “cost saving” measure.
Here’s the garment cutting department at a factory in Pakistan.
I once bought a used 80 ton hydraulic press from Levi’s. It was used to cut blue jeans, cotton fabric dust everywhere in it. It used maple plywood and die rule cutting dies that could produce 1000’s of jeans pieces a day, (polyester/cotton fabrics are a bitch to cut). The dies could be swapped in a few minutes and rebuilt in about an hour with simple tools. The cost of the dies were about $1000 US and could last up to a year.
Those hand operated cutters are fine for simple items made in small lots, but you want to make millions? They are useless.
*I rebuilt it to cut sandpaper discs and sheets using similar die rule dies that could cut 3000 to 4000 pieces per rebuild.
For pants? At scale, the dies are cheap and probably can be reused across multiple styles within the same brand and size. The difference between blue jeans and cargo pants isn’t the cut. It’s the fabric and accessories.
A roll of fabric is 54" wide. It will get rolled out in layers as long as the table allows. Now we need a press that can press over the entire length of the table and the table that will support that and the aforementioned millwrights and machine shop. Or we need any table at all and a guy with a knife.
Not to say there aren’t things made with dies but Occam’s Razor and a career in textiles leads me to believe it’s not as common as you think.
The difference between blue jeans and cargo pants isn’t the cut. It’s the fabric and accessories.
This tells me you don’t know what you’re talking about.
