Twitter 上的 Random task:"@chivas135 @DOATEC_OFFICIAL In Ninja Gaiden Sigma 2 Plus Rachel's red fiend outfit had the black bodysuit. It's likely they only bothered making one version of the suit, because laziness.
Ninja Gaiden Black & Sigma Part #39 - Ninja Gaiden Black: Post Game
Ninja Gaiden Σ - How to Unlock All Costumes (Ninja Gaiden: Master Collection)