If I was Federer I would always - always - wear black. Except at Wimbledon.
Just black everything. No sponsor logos, no batman wings, no fashion, no drama.
USO'07 was close.
If not black, then some other color. One color. Not pink, please. He was big enough to associate an entire color with his name - like #99 will forever be remembered in the NHL. Pity that he didn't.