Pictured is the RF Smash Clay Polo, $84 and RF Woven short, $52. Polos can connote a measure of tidiness that many men don't like on court. This one makes tidy kinda cool. Tennis mortals should wear black or white shorts with this shirt especially if they are going to wear the matching bandanna, $14.
Federer's shoes are the Nike Zoom Vapor 9 Tour in anthracite and cyber, $130. I LOVE these shoes; so hot looking and no break-in. Best with black socks though. White socks are a tad dated looking at the moment.