Reach the level noted below to unlock the specific costume listed.

Cowboy- Reach level 23
Desert Camo- Reach level 07
Future Warrior- Reach level 38
Gold Uniform- Reach level 99
Ninja- Reach level 50
Panda Suit- Reach level 60
Policeman- Reach level 10
Sky Camo- Reach level 18
Tough Guy- Reach level 15
Urban Camo- Reach level 30
Virtua Cop- Reach level 34
World War II Uniform- Reach level 20