There are a gazillion custom imprinting/embroidery options.
Here's a website I use for merchandise a lot ...
www.4imprint.com (well, I use their Canadian site)
For very small quantities of items like hoodies and shirts, you can try places like CafePress or VistaPrint, but they don't do jackets.
You could also just go buy a bunch of jackets from a regular retailer and bring them to an embroidery or silkscreening place in town to have them put on your logo, letters, names, etc.
The local places tend to be more flexible about custom options like multiple imprints (front and back) since they do the work themselves, some of the larger places like 4imprint seem to be just distributors who send out the work and have it drop-shipped.