Foster Dog Vests or Bandana

Any suggestions on where to purchase customizable vests (like therapy/service dog ones) or quality bandanas that I can have embroidered or screened with "Adoptable" or something like that? I want to use it for foster dogs when they're out in public.

I've found plenty of sites for bandanas, but I kind of like a vest better - it's a little flashier or noticeable? Anyways, any suggestions appreciated.