Why get rid of them? They're cool collector's items and fun to bust out once in a while. I threw on my Leandro Barbosa Suns jersey (from back when the Brazilian Blur was really good and won 6th Man of the Year) with some Barkley's at a pool party the other day and felt way too pleased with myself.
I'm a monster NBA fan so I have a bunch of my favorite players' jerseys. I try to stick to authentic jerseys from nbastore.com or Mitchell & Ness jerseys for active players and throwbacks, respectively. I also have a Desmond Howard Packers jersey haha he was the man. Soccer jerseys are kinda awesome too.
Nothin wrong with showin love to your squad or respect to your boy by rockin team colors.