silk dress maxi RUSH HOUR Elevate your evening look with this elegant Black Maxi Dress BTFBM Womens Mock Neck Satin

And something like THIS has a flared cut

Twist Wrap Dresses It also might be a good time to consider a Dessy Twist Dress which wraps loosely around your bridesmaid (in fact, you could put all your girls in one)

By combining impeccable fit with the highest quality fabrics, KAREN WILLIS HOLMES gowns are not only figure-flattering and gorgeous but also comfortable and made to an exquisite standard

I will let you know what I think

all in black but embellished with the alluring and feminine sparkle of a jet black and diamante garment brooch

Super smart with super casual is doable, but get a single detail wrong and you'll lose the equilibrium that makes the outfit work