When Justin Timberlake, free of his frosted *NSYNC curls, first sang of bringing sexy back, he was trotting out a saucy pop ditty. But this season designers appear to have made it their anthem. And by “sexy”, read: baring a whole lot of skin. There are dresses with necklines scooped daringly low at Thomas Tait, stapled seams on clingy dresses at Versus Versace and a sheer top with a band of sequins across the chest at Tom Ford, offering something just shy of that other trend: #freethenipple.