Best
Wolverine - Current brown & tan, X-Force, Classic Patch
Storm - The outfit she wore in her first panel appearance, her introduction costume, her Alan Davis costume from the 90s, outfit she wore during her brief stint with the Avengers, outfit she wore in her last solo(minus the mohawk)... there's more I'm probably forgetting. What can I say? Storm has a lot of great looks.
Bishop - his 90s costume, his mid-90s out without the scarf(and bald fade), his late 90s outfit(with the dreads).
Worst
Wolverine - his first appearance outfit(vs Hulk), Weapon X(dude is basically butt ass nekkid in a metal helmet).
Storm - her current outfit, her 90s purple costume, X-Men Gold outfit.
Bishop - his current outfit(Jake from State Farm lookin ass).