The currently popular name for this effect is "moobs," for man-boobs.

The term is believed to have been popularized by a Seinfeld episode in which man-braziers were a brain-fart by one of the characters. (He had decided his father needed some "support.")

I think that possibly "manzieres" were also mentioned.

I haven't checked to see if anyone has picked it up and is marketing the obvious products. Maybe someone with a need would want to do a search(?).

John