The past few months of quarantine brought back a 1960s fashion trend that has been making the rounds on Instagram, YouTube and TikTok: tie-dye ... made something very cool with minimum effort.

Tackling the hot, humid weather with ease, she kept cool in a cropped tie-dye T-shirt—the groovy print is summer’s breakout trend—and paired it with white cut-off shorts. She also slipped on ...