Noticed those slip dresses all over your instagram feed? There's a reason for that. Slip dresses are trending hard right now and you definitely need in. Shop the range of styles by Zara, Prada, Reformation and more to find your way to a perfect 90s grunge look. Layer green, red or black velvet over a plain white T-shirt to really nail the trend. This is the only look you'll need this season - so what are you waiting for?