A trademark used for underwear. This trademark often occurs in lowercase in print: “The venerable white-underwear company . . . had dabbled in socks, sweats, and fashion skivvies” (Advertising Age). “About 500 yards away, on three destroyers snubbed up to the dock, men were clambering on the deck in their skivvies” (Smithsonian).
I've got my skivvies in a bunch.
Slang for underwear, generally mens trunks or briefs, but can also be applied to singlets or undershirts. Can also be applied to swimwear or other skimpy items of clothing.
Not to be confused with skivvy, a long-sleeved, tight-fitting shirt.
Seeing Joe in his skivvies is definitely an inspiration to spend more time at the beach.