The Cummerbund Clocks Out of Black-Tie

The tuxedo's sash-like waist piece, long reserved for formal nights only, is showing up in everyday looks straight off the runway. Designers are pairing it with daytime pieces instead of saving it strictly for a dinner jacket and a ballroom floor. It's a small piece of black-tie grammar finding new life well beyond the occasion it was built for.

With reporting from Harper's Bazaar.