Lighter colours like that can be nice, yes, but its a different look, more casual, maybe better with rougher chinos etc Strange you feel that about dark blue and black, given the obvious navy suit and black shoe combination
A plunging V neckline is balanced by long sleeves, while a centre cut-out adds bold allure
However, if the black tie event is slightly less formal, some hosts may be okay with you wearing a black suit with a classic necktie
Is there a solution
Whichever shoe style you opt for, make sure its comfortable enough to dance the night away
You can expect designer bridesmaid dresses from Bill Levoff, Bari Jay, Allure Maids and Wtoo from Watters