Long sleeve shirts (with and without collars) and knee socks are what I want. Some sleeveless shirts and headbands would be cool, too. I plan on spending many hours throughout my travels changing clothes, so I want as many options as possible. Hell, if we can change clothes at Pokemon Centers like I think I read somewhere, I may adapt a new duds for every city.
EDIT: Ooooh. Dress shirts and dress pants as well.
EDIT 2: FACIAL HAIR! I can't grow a beard myself, but that doesn't my avatar can't have a sick ass bush. I feel like that may be pushing it, though.