Here's details of all the bonus costumes you can purchase ... You need to play through the game to earn the medals!

American Cheerleader - 15 Platinum Medals
Bunny Costume - 27 Platinum Medals
Busujima Saeko's Outfit - 25 Platinum Medals
Cordelia's Outfit - 31 Platinum Medals
Crash Helmet - 29 Platinum Medals
Dad's Outfit - 35 Platinum Medals
Date Night - 30 Platinum Medals
Haruna's Outfit - 25 Platinum Medals
Japanese Maid Outfit - 85 Platinum Medals
Manyu Chifusa's Outfit - 25 Platinum Medals
Miyamoto Rei's Outfit - 25 Platinum Medals
Mom's Outfit - 37 Platinum Medals
Purple Pride Uniform - 20 Platinum Medals
Rosalind's Outfit - 33 Platinum Medals
Sexy American Casual - 10 Platinum Medals
Sexy Rider Outfit - 90 Platinum Medals
Sexy Shell Bikini - 80 Platinum Medals
Shiro's Outfit - 25 Platinum Medals
Striped Bikini - 75 Platinum Medals