@Surprise177 She's probably wearing
stays which are like a corset but a little different, they are not known for cinching the waist so much as an undergarment that supports the boobs and maintains the form of the outer garment.
Or she could have a sewn in shelf, like you get with modern bra-less camisoles.
(thought you talking about the green lady's outfit.)
Edit: Oh did you mean Dark? He's flat as an airport runway, I think his pecs in his old body were bigger. He never needed a bra for his man boobs, I don't see why he would start wearing them now.