Shapewear by occasion. Every page gives a verdict first, then the fit rule, then the size. Some say no; those are the pages that make the rest believable.
Shapewear for a holiday partyYes. December parties mean sequins and velvet, a coat on and off, standing, sitting and eating. Wear the thong in Black under a dark party dress, straps set so the deep V sits under the neckline.
Shapewear for a wedding guestYes. A wedding is six to eight hours with a meal, dancing and a bathroom queue. Wear the medium-firm bodysuit you can eat in, with the hook-and-eye crotch closure for the queue. Cut by dress; straps set at home.