caleçon

Je dors en caleçon.

I sleep in my boxers.

Mon caleçon est noir.

My boxers are black.

Ton caleçon a un trou.

Your boxers have a hole.

Il a oublié son caleçon.

He forgot his boxers.

Ce qui me le fit mettre dans les poches de mon caleçon de bain...

Which made me put it in the pockets of my swimming trunks...