Since the '60s, tie-dye has come back in waves, each time in a new form. While the last time we wore it probably was in crop-top form, just like Rihanna did in 2005, the psychedelic print is back and stronger than ever, having been splashed onto practically every single Spring runway. From hoodies to dresses, skirts, t-shirts, and denim, the only rule to wear tie-dye in 2019 is to have fun.