Is it me or is it hot in here? Net-a-Porter challenged Preen Line to create a must-have dress for under $500. They succeeded — $380, to be exact. This Vogue-featured frock is undeniably Preen, from the lace-up detail to the asymmetrical shoulder. It can be found in NAP's Designer Exclusives section where you can sign up to be alerted when it's ready for the taking.