Since there is no universal social consortium on what constitutes sexiness, I'd say it is whatever makes the wearer feel sexy.

Juno's clothes are neither sexy nor elegant. They're tasteless, old-fashioned, and lack style. Jupiter is miles away from being a fashion expert. So keep your wisdom to yourself.

I always love the way Juno dresses:) Also a fan of modest dressing for myself in all worlds. No judgement for those who want to bare more. Just a personal comfort and preference.