question on DoA3 3rd costumes

[lord shishio]

I just unlocked one of them, but i'm not sure how exactly I did it, does anyone know how?

[Sepho]

Kasumi's 3rd costume
Successfully complete exercise mode in Sparring mode to unlock Kasumi's schoolgirl costume.
Zack's 3rd costume
Defeat twenty opponents in Survival mode to unlock Zack's silver bodysuit costume.
Ein's 3rd costume
Successfully complete Time Attack mode in under six minutes to unlock Ein's shirtless costume

One issue of the Official XBox Magazine came with a content disk that contained extra costumes for all characters (four or five in some case).

More important than all that:

Unlock Ein from DOA2 and Random character select
Successfully complete the game with all fighters and play as Hayate in survival mode. Defeat at least three fighters (or at least as many as it takes to get a ranking), then enter "EIN" at the initials screen. Ein will now be unlocked in all modes except for Story mode.