Find the following outfit pieces by searching the corresponding locations. Note: All outfits have the same function as in Dead Rising 2. The Protoman outfit is a throwback to the original Dead Rising, except you have a shield as well as a cannon.
SOLDIER OUTFIT PIECE
In a box in the vacant store to the right of the Ultimate Playhouse at South Plaza.
Earn the "Save the Girl...Again" achievement or trophy.
In Shank's in the Palisades Mall.
Purchased in the Platinum Strip Pawnshop.
PSYCHOPATH OUTFIT PIECE
In the security room in Fortune City Arena.
Defeat Carl in mail order Zombrex mission.
Watch the Timeshare movie in Paradise Platinum Screens in the Platinum Strip, from 12 a.m. to 2 a.m.
In the Wedding Chapel on the Silver Strip.
NINJA OUTFIT PIECE
In the Man's Sport store in the Uranus Zone.
Earn the "Elite Killer" achievement or trophy.
In a hidden room along the Ninja path in the Royal Flush
On the mannequin by the entrance to Shoal Nightclub.
SPORTS FAN OUTFIT PIECE
In SporTrance in the Royal Flush Plaza.
In KokoNutz Sports Town in Palisades Mall.
At the end of the Ninja path in the Americana Casino.
In the back room of Hot Excitorama on the Silver Strip.
PROTO MAN OUTFIT PIECE
Earn the "Challenge Experience" achievement or trophy.
In the Ultimate Playhouse in the Palisades Mall.
Earn the "Save the Girl Yet Again" achievement or trophy.
Defeat Jack at strip poker in the Ante Up mission, or defeat him in Sandbox mode.