Let your hemlines follow suit and step out in a minidress: The look has been keeping dedicated followers of fashion cool since the 1960s. And now it’s time to let your legs get the light they deserve. Faced with this challenge, brands are bringing into minidress territory some of the fan-favorite attributes of the more covered-up styles that have consumed our attention in recent seasons—billowy sleeves, vintage-inspired prints, loose-fit skirts…