Any time Gigi Hadid steps out on the street [1], her signature cool style catches our attention. But when we spotted her out yesterday not once but twice, we had to do a double take, because she managed to make one outfit look totally different from day to night.

Gigi stuck to simple yet chic basics in sleek Blue Life Fit zippered leggings [2], a black tank, and a Max Mara Whitney bag. But the secret to her fashion formula was that she upgraded the outfit from day to night with just a few simple accessory swaps. While she spent the earlier hours in casual sneakers and oversize sunglasses, for a night on the town, Gigi dressed up the look with black booties and a glossy navy and black leather Tart Collections jacket. Leave it to Gigi to transform casual-cool to seriously sexy [3] with minimal effort; clearly the model knows how to make the most of what's already in her closet. So before you head into the weekend, check out Gigi's day-to-night look and find out how to give the same style swap a spin for yourself.