But yea, it would be cool to have some shirts/sports gear reminiscent of the local sports teams' colors (I'm guessing logos would be copyrighted). Have the devs stated in which part of the word the game takes place yet? If it's around Canada, I can tell you that at least every other house has 2-3 hockey jerseys in them. Also a lot of canadian football jerseys.. and very little MLS (soccer for NA - football for the rest of the world) jerseys.
It would be hilarious to have Canadiens VS Maple Leafs deathmatches (although the Maple Laffs would fail hard, as they always do in real life!)
Seriously though, sport gear colors would be a great way for clans to recognize their members and enemies/neutrals.