What you wear under your dress and next to your skin is important for your comfort, as well as ensuring a great fit. While no body is the same, here are some resources for those looking for smoothing, sculpting, lifting, concealing, and supporting. I'll also happily advise you during fitting. 

Commando Shapewear ("smooth, not stuffed" seamless and slimming panties, briefs, thongs, and body suits)

Bare Necessities Shapewear (multiple brands, variety of shaping underwear, bodysuits, and slips) 

Naja Nude for All Undergarments ("underwear for hope", 7 shades of nude to match various skin tones)

The Town Shop (Shapewear, bras, and traditional corsets and bustiers)

Spanx Shapewear (3 levels of shaping- smooth, shape, sculpt)

Ender Legard (pricey but perfect options for low back, low front, and sculpting body suits and corsets)

Sara's Lingerie (variety of brands and options for shapewear, bras, and all undergarments)

Misses Kisses (frontless bra for plunging necklines)

Ruby Ribbon (shapewear)