Costumes are probably the best individual addition that Golden ever makes. Once I got those Gekkoukan uniforms, oh man. No going back. That said, Yu's uniform really doesn't flatter him.
Yosuke, on the other hand, looks
amazing with a Gekkoukan uniform on. Works much better than his Yaso uniform. That unbuttoned coat does wonders.
But while the Gekkou set is the best (with the Feathermen costumes a very close second), Chie probably has the best overall set of costumes. The track suit is king. The best
single costume in the game definitely goes to Yu's Dojima get-up, though. Complete with the slung-over coat, oh jeez.
...man, I
still wish that Rise had her own costumes in P4G. Missed opportunities, argh.
While I'm on this tangent, what're PersonaGAF's favourite P4G costumes?