There were chest wigs on sale for real in the 70s (maybe early 80s) because real men were deemed to have hairy mats on their chests, a la Burt Reynolds, and some deluded fools thought that without a hairy abdomen they were somehow less than adequate.
They were right of course, but it had nothing to do with their chests.
Myself, I never managed to cultivate a decent hairy chest as a youth, merely two unsightly hairy nipple rings.
I do, however, have a light and appealing cover of hair right across the chest now that it's out of fashion, and now that the chest has slipped to the mezzanine floor, as it were.