There are different degrees of sexiness. Revealing too much tit is simply tacky, showing off your legs comes across as obvious and a big bum in tight stretch is, well, a tad Kardashian. There are, however, other ways to be sexy, which are more classy and subtle: the presenting of the neck or the flip of undone hair.
In the same class of sex appeal is the shoulder. For Spring / Summer 2017, designer Vladimir Karaleev seems to have fallen in love with this body part.
There are sleeveless shirts, blouses with dropped shoulder seems and tops that accentuate the shoulder with a piped cut-out. His entire collection seems to literally hang off of them. Even the pieces having no built-in gimmick around them are cut in a way that accentuates the squareness of the shoulders to convey subtle sexiness.