Studs Up Football Club. I just thought I'd give them a mention because they have fantastic shirts, and I think I'll certainly be getting myself a few in the future.
If you're not interested in buying awesome shirts, I highly suggest you check out Studs Up. Chris Toy's hilarious comic strips are relatable to what's going on in the world of soccer right now, and his writing is wonderful. He has plenty of cleat and gear reviews worth checking out, so head over there if you've got time to spare.
Here's the official SWU Youtube video of opening the shirt along with a few pictures of it. It's my favorite of the selection, but there's plenty other awesome ones!