Successfully complete 100% of the side missions to unlock the Brassiere and Bikini 2 costumes. Successfully complete 100% of the Blacklist to unlock the Brassiere 4 and Sarong costumes. Interrogate the following characters to unlock an alternate costume at the indicated location:
Rag Shack
Crowe in Chapter 2; Abandon Subway
Ralph in Chapter 2; The Hole
Diana in Chapter 3; Railroad Yard
Freddie in Chapter 3; Hospital
Mike in Chapter 3; Station Zone
Dirk in Chapter 5; Station Zone
Freddie in Chapter 5; Basket Ball Court
Hospital
Matt in Chapter 2; South Side Park
Freddie in Chapter 2; Railroad Yard or Chapter 3; Station Zone at basketball court
Tim in Chapter 3; Railroad Yard
Clinic
Patrick in Chapter 2; Hospital Zone or Chapter 3; Shopping District
Mike in Chapter 3; Station Zone in front of Las Sombras Cantina
Freddie in Chapter 3; Abandon Subway
Killer Gear
Frank in Chapter 2; Downtown Street
Penn in Chapter 3; Harbor Gate (pay $500)
Hyde in Chapter 3; Downtown Street (pay $500)
Rodney in Chapter 3; Shopping District
Hazard in Chapter 4; Gas Station
Guyina Suit in Chapter 5; Harbor Gate
Penn in Chapter 5; Abandon Subway
Dick's Barbershop
Cobb in Chapter 3; Gas Station
Cobb in Chapter 5; Southside Park
Surfer in Chapter 5; Southside Park
Cobb in Chapter 5; Railway
Nigel in Chapter 3; Station Zone under stairs leading to rooftop
Completion bonuses
Successfully complete Story mode to keep your previous amount of money and your Blacklist entries. Successfully complete Story mode and defeat Chester to have him as an ally. Successfully complete Story mode with all five characters to unlock the "Movie Viewer" option. Successfully complete Story mode with one of the following ranks to unlock the indicated bonus(es) when a new game is started:
Czar: Charisma Pheromone
Governor: Fatima as an ally, Charisma Pheromone
Ruler: Eugene and Fatima as allies, Charisma Pheromone
Investor: Turkey
Super-Rich: Quincy as ally, Turkey
Ultra-Rich: Tracy and Quincy as allies and Turkey
Samurai: Bulletproof vest
Beast: Ignacy as ally, bulletproof vest
Tyrant: Gregorio and Ignacy as allies, bulletproof vest
Good Citizen: The Hole sells weapons and items
Boss: Melvin as ally and The Hole sells weapons and items
Don: Wallace and Melvin as allies and The Hole sells weapons and items
Godfather: Zanetti, Wallace, Melvin as allies, and The Hole sells weapons and items
Gina
In Mission 4, find out that the drug deal is at the wharf. Go there and go in the middle storehouse. You will have to fight some Zanetti gangsters. Once they have been defeated, go to the back of the storehouse and you will find some open cellar doors going down. Go down them and an intermission sequence with Gina waking up on a bed down there will appear. Talk to her to have her as an ally.
Jason G
In Chapter 4, go to the gas station. There will be three gang members. Defeat them and Jason G will appear. Defeat him to have him as an ally.
Lola
Defeat one of the five Fatimas Saints in Chapter 2. Then, go to the police station and rescue Lola from the cell area to have her as an ally.
Raven
Go to Southside Park in Chapter 4. If met by Raven, defeat him to have him as an ally.