Gym Wear?
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For workout shoes, I really like Vibram.
http://www.vibramfivefingers.it/eng/produtcs.aspx
If you're practicing martial arts. I suggest fight gears from Hayabusa.
http://www.hayabusafightwear.com/
I normally just wear whatever when I'm at the gym. Gonna buy some cheap ass Hanes Beefy t-shirts.
Wear it, Stretch it, Thrash it.