5. The Joker
To list a popular hero suit would be tricky, given that they tend to change between different versions of hero movies. But Batman villain The Joker has kept his costume relatively similar throughout the years, from Jack Nicholson to Heath Ledger—and it's wonderfully ridiculous. The slightly oversized purple suit coupled with face makeup, a painted grin, and green(ish) hair suits The Joker perfectly.
4. Hannibal
Hannibal's infamous muzzle mask, coupled with occasional all-white, clinical looking outfit is devastatingly effective. Picturebox's movie blog recently reviewed Hannibal and cited the movie's wonderful blend of grace and menace in depicting Anthony Hopkins' Hannibal Lecter—but how about madness? Grace and menace are all well and good, but Hopkins' villain, with many thanks to his suit and mask, became the very image of criminal insanity.
3. Boba Fett
I hate to put two Star Wars outfits on this list (see #1), but Boba Fett's jetpack suit is so well regarded by fans that it's elevated the character's fame way beyond what it should be. You'll probably recognize a Boba Fett poster even if you haven't seen the movies in five years. But re-watch them and you'll probably be shocked how small a role he actually plays!