I’m actually a fan of “off the shoulder” dresses. I think they add a bit of sexiness and allow for showing skin without being gratuitous.
Some of my favorite dresses include:
I could post more but this is a pretty image intensive post already 
Unfortunately Alanna’s Embrace is no longer available (but maybe Blizz will bring it back). The Necro-Knight’s Garb is also no longer available but a craftable version is coming in 10.1.5!