I know I'll lose, but I want to field a team wearing dapper suits.
Bruno Mannheim, Intergang Underboss, Maggia Goon, Bruce Wayne, Diana Prince come to mind. Any others? I could dust off Gentleman Ghost, I suppose.

DKR Lucius Fox
DKR Alfred Pennyworth (although a butler's suit might be debatable)
DKR Miranda Tate / Savatore Maroni / Carmine Falcone
The Joker (that's a custom-tailored purple suit!)
DKR Harvey Dent/Two-Face
The Penguin
DC10 John Jones
King Pin
WXM Shadow King
WXM Black and White Kings (not exactly your dapper suit but they're still well dress)
IIM Pepper Potts / Bethany Cabe
IIM Happy Hogan
Tony Stark
SLoSH Black and White Witches (looks like they're dress for a ball)
Prof. X
DP Hammerhead
CATWS SHIELD Agent / Agent Sitwell / Maria Hill
AVM Agent of SHIELD / Agent Coulson
DoFP Sen Robert Kelly
FL The Fiddler (yeah, it's green but he's still well dressed)
Phantom Stranger (cape's probably over-kill but that's a gentleman's outfit)

I believe you can come up with a decent to competitive team.

Batman 202 Bruce Wayne is in a suit and is a great support piece.

I think Hulk on the Con Ex duo piece is in a pretty snazzy suit.

The question has a suit on with a long coat over it.

Black Mask

JLTW062: Envy

Old school well dressed bricks:

Mr Fixit
Blockbuster

Originally designed by a friend of mine to include a bunch of con artists as a thematic team, this is now the ornamentation on his computer desk.