As promised, a small collection of dresses that would work paired with opaque tights. Unfortunately there is not a huge selection out there, but I've pulled together some of the better looks.
Empires are flattering on most body shapes, but it looks like this one may not have left enough room for the boobs. Definitely a contestant for order-online-try-on-and-return-if-necessary. Also available in black.
Cowl Neck Knit Dress
$48 at Avenue
Love this for night time. The rouched bodice probably is more appropriate for women who want to enhance, rather than minimize, their busts. Wear colored tights to brighten things up.
Muse Jersey Poet Dress
On sale for $64 at Nordstrom
I love sweater dresses. They're great for both work and weekend, and I promise you'll live in them if you pick up a few. Plus the material is good camouflaging certain areas.
Calvin Klein Cable Bodice Sweater Dress
On sale for $118 at Macy's
This is a good option if you like color. Contrary to popular opinion, larger prints actually look better on larger women. The bell sleeve will help with air circulation. Definitely keep accessories to a minimum.
INC Boatneck Ruffled Dress
$89 at Macy's