Yeah, they do, but theu're not as readily available as one would think. They also don't advertise this possibility, if they even take such jobs (Many don't like to take on your standard wallmart jeans etc. for one reason or another). On top of that, I'd imagine that they'd take surprisingly large sums from such "extraordinarily custom modifications".

What I'm proposing is specializing your sidehustle to this "one trick pony", that is basically just making people realize that fake pokets can be turned in to a real pocket. This would provide a seamsperson quick small jobs as long as fake pockets are being made. And judging by the fashion industry, it will be a long time before they realize that those pockets don't need to be fake.

This is more of "call to arms" to "fight the power".