The most common in fiction however remains the nazi gas suit.
But if you wanted to make this realistic and really iconic, the way you'd do it is tightening an oversuit with straps to make it suggestively skin tight.
All the straps for gear have to be worn over the suit so the gear is accessible, so simply an empty load bearing vest would probably achieve what you want.

Because I know what you're going for here, you need to avoid the inference that it's a gimp suit, your character isn't a novelty prostitute. So imagine (ideally picture) the female uniform alongside a male uniform to give it legitimacy. This is specialist clothing a specialist unit was deployed with, it's impractical in most contexts but they have it for a reason.