1. Formal Pajamas — This year, we channeled our inner-Julian Schnabel. Whether it was a collective effort to trick ourselves into thinking it was alright to wear sleepwear outdoors or not, this formal pajama phenomenon might be our decade's version of the Juicy Couture tracksuit.

Piamita Isabelle Top, $190, available at Les Nouvelles; Piamita Pajama Pant, $198, available at Les Nouvelles.