@KNOWITALL I’ve seen both, but I think most men do. I’ll have to pay attention now.
My husband wears undershirts almost every day, even under t-shirts at times. I think mostly to protect the underarm of the outer garment, maybe it’s for the nips too? I never asked him. I know he thinks it’s odd that men where tank style undershirts since it doesn’t protect the underarm.
When my in-laws were living with me I felt I had to buy bras to go under my pajama top with my FIL in the house. I bought a couple with no wire, and more stretchy just to cover my breasts better and hold them up a little.
@LadyMarissa Well times have changed, and the hard body, bounce a quarter of her ass is now often in thong underwear, with her midriff showing, and double D cup fake boobs.
By the way, shapewear can actually be bad for your health when worn too tight.