Complete the indicated task to unlock the corresponding alternate costume. Use the dresser in the corner of Parin's room to change costumes.

Costume	How to unlock
Armor	Give 30 Gold Medals to Hyperbolic in Beginner mode.
Chinese Dress	Get the good ending in Hard mode.
Kimono	Set the system date between January 1st and 7th.
Leopard Suit	Get the good ending in Crazy mode.
Maid Outfit	Can be bought from the vending machine at Spinach Caverns - Shadow Grotto.
Monkey Suite	Get the good ending in Beginner mode.
Nurse Outfit	Complete Boss Rush mode in Happy mode.
Pajamas	Get the good ending in Normal mode.
Princess Dress	Give 30 Gold Medals to Hyperbolic in Normal mode.
Samurai Outfit	Give 30 Gold Medals to Hyperbolic in Crazy mode.
Santa Outfit	Set the system date between December 25th and 31st.
School Uniform	Get the good ending in Happy mode.
Swimsuit	Complete Boss Rush in Crazy mode.
Vampire Outfit	Give 30 Gold Medals to Hyperbolic in Hard mode.
Witch Outfit	Give 30 Gold Medals to Hyperbolic in Happy mode.
Work Uniform	Complete Boss Rush mode in Hard mode.
Workout Gear	Complete Boss Rush mode in Beginner or Normal mode.