To do this you will need to have beaten the game and unlocked the 2nd amendment mini game. Also, to finish the suit you must go to the toy store in the movie theater to retrieve the helmet.
Unlockable How to Unlock Megaman Boots Beat all "2nd Amendment" mini-games Megaman Tights Beat all "2nd Amendment" mini-games with an "A" rank Real Mega Buster Beat all "2nd Amendment" mini-games a "S" rank
Unlockable Mini Games
Unlockable How to Unlock Odd Jobs Beat the game. Second Amendments Beat the first four Odd Jobs missions.
Once you complete the game you will be able to play through with a new game +, carrying over all of your past inventory and levels.
Unlockable How to Unlock "The Drunkard" Get an S rank on the mission "Out of Controll" to unlock the mission "The Drunkard." 50. Cal Machine Gun Get an S rank on "The Woman Left Behind" mission Ammo Belt Get S rank on "Gun Shop Standoff" mission Apocalypse Frank Kill 53,594 Zombies Arthur Boxers (Hearts) Beat the game without dying. Bikini Outfit Beat the game with an A ranking Bionic Commando Beat the game twice. Chicago Typewriter Beat the game Cultist Leader's Sword Get an S rank on the mission "A Strange Groupe." Hockey Mask Get S rank on "The Cult" mission Killer 7 Beat the game once and instead of Cletus giving you the repaired Blacktail, he'll give you the Killer 7. Kung Fu outfit Beat game twice on Hard Laser Sword Beat all Odd Jobs with an "S" Rank Mall Employee Uniform Get an S rank on "Out Of Control" mission Megaman Boots Beat all "2nd Ammendment" mini-games Megaman Tights Beat all "2nd Ammendment" mini-games with an "A" rank Police Cap Beat the game with an A Rank or better, save all survivors, and do not allow any to escape. Prisoner Garb (Costume) Get S Rank On Prisoners Mission Pro Wrestling Boots Beat all Odd Jobs missions Pro Wrestling Briefs Beat all Odd Jobs missions with an "A" Rank Real Mega Buster Beat all "2nd Ammendment" mini-games a "S" rank Red 9 Complete the mission 'Lovers' with an S Rank. Riot Gun S Rank On Dressed For Action Roll Outfit Beat it on Hard with S Ranking School Clothes Beat the game with an A rank. Semi-Auto Rifle S Rank On "Mark Of The Sniper" Small Chainsaw Get an S rank on the mission "The Shadow of North Plaza." Small Mixer Beat the game and Cletus will sell it to you. Special Forces Outfit Beat the game on Hard Turret Gun Get an S rank on the mission "Prisoners." White Hat Clear the game with 100% Item Usage