(Thanks for chiming in, Christie. You looked AMAZING in the dress).
I LOVE this dress. One of my faves at the NAS. Yes. Am a purist about outfit lines - but understand the need to stay warm too (probably better than anyone else).
I think a low contrast short jacket could work. Or a longer - any colour - jacket/coat. A high contrast jacket would work well if it was left open and fluid. And the right footwear is the finishing touch.
Viv, this is an excellent style for you. Please try it.