Plunge Neck Underwire Chemise with Lace Inset

Not the first time I've found that a one-piece in sensual lingerie doesn't work for my body, as opposed to buying a bra and panties of whatever style separately. I am a true Medium, size 8/10, and a 36 B (34 B if strapless) in a bra, or M/L in panties. I bought a L for the sake of the lower part of the fitted chemise to have a flattering not squeezed tight fit, and found the bra to have a saggy, not lifted fit, yet below that, the body was looked like it was meant to be firm shape wear, clinging to and exaggerating "flaws". Returned and will look for separates or a flouncier fit beneath a Medium size top.

It’s sexy but no wiggle room and that piece in the middle keeps twisting