There are a few independent clothing labels inspired by gaming floating around the net but I thought these guys were one of the better ones.
Some of you may be familiar with them as they launched the official MGS: Peace Walker clothing line. They have since relaunched their site and added other popular gaming clothing lines as well. The Assassin's Creed and Hitman lineup are available again, and the rest to follow shortly.
Check them out!
https://www.musterbrand.com/
PS: No, I don't work for them but I did order the Peace Walker Foxhound shirt when they first launched and it was really high quality.