Besides the most famous red and black Deadpool costume, Deadpool has lots of alternate costumes more than we think, here I listed his costumes appeared in comic books and video games.
Deapool costumes from Marvel vs Capcom 3 and Ultimate Marvel vs Capcom 3:
1. Original Deadpool Costume;
2. Yellow and black outfit with default mask, red wrists and ankles, "X-Men" and "Deadpool" logo in red on front and back respectively (Deadpool #17). This costume refers to an alternate universe where Deadpool was recruited as a "modified" human member of the X-Men and wore that costume.
3. Olive green and black outfit (Deathwish)
4. Yellow and blue X-Men Costume, blue X with red outline on right side of chest, yellow pouches (Weapon X: Days of Future Now)
5. Inverse black and red outfit, silver pouches (Weapon X)
6. Gray and black outfit, red X on belt with red eyes, military gray pouches (X-Force)
7. Cablepool (Parody of 90's comics) (DLC - Evil Twin Costume Pack)
Other costumes:
1. Ballerina Deadpool (Gold in Great White News HQ): Deadpool wearing a frilly skirt and tiny crown over his suit (swords replaced by magic wands);
2. French Maid Deadpool (Gold in Magneto's Prison): Deadpool wearing a french maid's had and brazier over uniform (sais replaced with feather dusters);
3. Pirate Hat (Deadpool's Carnivale, Infinite Mode only): Just Deadpool in the same Pirate Hat he wore in the actual level;
4. Chef Deadpool (Gold in Citadel Courtyard): Deadpool wearing chef's hat and no mask (swords replaced with spatulas, sais replaced with rubber chickens)
5. D-Pooly (Inside the Tower): Deadpool wearing a red and black track suit with a bandana and lot's of bling.
If you find any other deadpool costume, please be kind to let me know;