As its name suggests, it is a skin-colored bodysuit that exposes large amount of skin of the wearer, which combined with the color of the suit itself (with the "skin" part of the suit suggestively covering Eve's breasts and ass) can make Eve appears as if she was naked.
Not recommended for new players as it greatly increases the damage Eve takes, making the game considerably more difficult.
In-game description:
"Changes the appearance of Eve. Skin suits are outfits specifically crafted by Mother Sphere. It covers the body of Airborn Squad Member and deploys on its own, or expands and contracts depending on the situation. In other words, it's like a living skin. (Shield is disabled when you put on this Skin Suit.)"
