Guy Gardner - Green Lantern green moon boots say style
Supermans black outfit from reign of supermen all it needed was a silver cape to go with the silver S shield
Batmans all black outfit from around 2000 it was functional and true to the character I dont know why they changed it
Troias new outfit (before she died) with the stars on it
War Machine best look for armor there is and not piloted by an alchoholic

That's a tough one, my preference is a tie between Captain Mar-vell and Hal Jordan's Green Lantern.

I'm surprised, only 1 person has said Spawn, he is by far the best dressed dude.

I'd say black panther, but it looked ten times cooler drawn by mark texeria; otherwise it's just pretty good.

Dr. Strange has always looked cool.

I like the Amazing Bag Man! That was cool.

With Guardian and Original Taksmater is tough!

Ghost Rider (Dan Ketch)

Batman

The Joker

Oh and Marvel Boy (without Armour and Guns)

I gotta say Psylocke.
and shatterstar

Male:
Angel (blue and white halo costume)
Captain Marvel (SHAZAM!)
Flash (Jay Garrick)
Reverse Flash

Female:
Storm (classic black outfit)
Spider-Woman (black costume)
Warbird

Extremely cool, he is one of my favourite heroes, geez i could talk about him all day.

Uhm some runner's up.
Silver Age Batman. The original Vindicator's battlesuit.
Wonder Woman, and Aquaman's orange shirt outfit. Very few guys look good in orange.
Finally Honorable mention, tv's Batgirl. Comon admit how many of you out there watched the show just to see her in that ohh so tight costume? And secondly Helen Slater as Supergirl, only reason i'd ever consider watching that piece of junk again. Uhm excuse me I gottsa go.

Marvel Male - Captain America, Punisher, Wolverine (yellow and blue version), Moon Knight and Black Knight.
Marvel Female - Elektra (red and black versions), Psylocke.

DC Male - Green Arrow (Long Bow Hunters version), Shazam, Golden Age Flash

DC Female - Catwoman, Wonder Woman, Huntress.

No one says cool like Doctor Strange!

The Joker, 'cause no one else makes purple look cool.

Actually, I like Ghost Rider, Captain America, and Jack of Hearts.