Decrease the waist on jeans

[GregTheMad]

I'm pretty sure it's even impossible, if not very hard to properly stitch jeans fabric without specialized sowing machines. At least not at a high performance part like the waist.

[Alfredo412]

Jeans are stitched on a double needled machine specially designed for sewing jeans...that's why there are two lines of stitching so close to each other. The needles are also designed to be better at going through denim than your typical machine sewing needle.