To this day, I have no idea why there isn't a local service to mod deeper pockets in women's clothing. If I was a proper tailor, I'd probably start such service myself, but every time I openly mention that such service would probably be profitable, everybody goes "Yeah, I'd be using that service", but never anyone who can actually do the job, rises to the ocasion and starts a bussines.
So if you're reading this, and can handle your needle and thread, here's a bussiness idea: take a small fee to cut open, and expand pockets in clothes there have fake pockets.