Esto lo he tomado de una guía de gamefaqs:
Citar:
- COSTUME: There are four costumes to choose from: Normal, Special1,
Special2, and Special3. The Normal costume is the default white blouse and red
scarf. Special1 costume features a dark brown cardigan and cute little gloves
(they look like driving gloves). The Special2 costume has a deep blue blouse
with a fancy design on the back and white stockings (with garters!); Miku even
has blue hair! The Special3 costume has a dark cardigan and patterned scarf,
leather skirt, black stockings; also Miku wears pale lipstick and has a darker
complexion. But apart from being cute, when Miku wears a Special costume she
will run just a little bit faster!! Costume1 becomes available after you
defeat the game for the first time. To unlock Costumes 2 & 3, you must also
beat the game in Nightmare mode.
En total son 4 trajes (el quinto es de xbox, así que nada). Al parecer para desbloquear los trajes tienes que jugar en modo difícil.
Normas 
