Please don't consider this a plug, but I have made numerous Shirts and other things for my Damned Squad members as well as for other different squad's members........even made some Aces High Convention T-Shirts back around 2003/2004.( for the Last AH Convention )
check out the link and thumb through the different pages
can add game handles/ game-ids call signs etc.......
can do custom designs for your particular plane type etc.or what have you......
http://www.cafepress.com/damneddrivethruanyone can do it themselves if they so desire to go thru the process of setting up an account, and designing what they want.......I have not updated the online catalog for a good while though........ only make new things for squadmates at their request.........