Tie-dye is back -- and it's cooler than ever! The colorful trend, which first made waves in the '60s, has returned and it's swirling all around the market, Instagram and worn by your favorite celebs. The best part? Lately, it's been popping up on more comfy clothes like sweats, which are perfect for these long days at home. Check out some of our fave tie-dye looks as of late.