Y-fronts

plural noun

1. boys' or men's underpants having a front opening within an inverted Y shape

Example Sentences

"I suggested he come as Brad, the nerd who wears a doctor's coat and Y-fronts. I don't think he was impressed."

From BBC

They end their performance in sagging vests and Y-fronts.

From Reuters

Croatia's Let 3 will perform as the penultimate act and end their performance in y-fronts.

From BBC

As a funky counterbalance, he showed rubbery translucent flasher raincoats worn over what looked to be Y-fronts; shearling coats with innards exposed; and T-shirts, their fronts printed with faces, pulled up over models’ heads — a pretty direct quotation of those created by Matthias Vriens a decade ago for his label BL33N and sold at Colette.

From New York Times

He picked up my discarded Y-fronts from the floor and held them open with his splayed thumbs.

From The Guardian