Traditionally, there were only two sartorial approaches to cleavage: show it off or cover it up. Unbutton an extra button for a sexy hint at what's underneath, or button your top all the way up for a stylish and modest look.
While we mulled over which look to try, designers were drawing up (and sewing up) a much better idea. After scouring the runways of NYFW, it's clear that boobs are out, and backs are, well, back en vogue. Say hello to back cleavage.