It’s a stretchy material. If you’re skinny and I mean like 100lbs typa skinny get a xs it will fit. The material isn’t sheer but it definitely does fit nice tho and it’s comfortable to move around in , it’s thin in a good way , it’s breathable not thin to a point where u can see you’re panties but tho I recommend this

Loveeeeeeee this. Perfect fit. I’m 5’7, around 150lbs & I got a medium. Fit perfectly.

Completely worth it

This outfit gave what it was supposed to give!!!!!!! I almost ordered a large until I read the reviews. I opted for the medium instead and it was perfect. I'm smaller chested but my hips and thighs are bigger. So the stretch was perfect and super comfortable.