Saber from Fate/stay Night.
Her armoured battle dress was pretty cool looking. Like a hybrid of Princess Zelda's dress and Link's armoured Zora tunic with an added extra layer of metal for good measure.
Edward Elric has a pretty cool looking red coat. (It'd probably be cheating again if I mentioned Dante from that DMC anime so I'll pass there.)
Lelouch (Code Geass) had a pretty cool looking helmet. I don't know if his Knightmare frame would count here or not... If it does then that was a pretty cool suit too.
Other than that I really can't think of any one character's outfit that stands out.