It's a kinda silly in game excuse, but mostly I just feel like they missed an opportunity with the character. She can go invisible, she can change the color of her skin to some extent, why not just say she has octocamo esque technology built into her skin and have her blend in? It'd be useful for a sniper, and if Kojima wanted her to be in that outfit the rest of the time so be it, at least it makes a bit more sense for her clothing to be skimpy if her skin acts as a changing camo suit.
My real problem is with the way the camera is constantly ogling her, or her random helicopter yoga.
My real problem is with the way the camera is constantly ogling her, or her random helicopter yoga.