So I'm still looking for good seamless underwear for my wedding dress and other chiffon dresses. Angie suggested I try the Soma vanishing edge underwear. There is no Soma store near me so I will have to order online. I was wondering if I could get some sizing advice. How do they compare to VS or gap underwear? I tend to size down in underwear so long as it is cut with a generous back coverage since if I follow the size chart the front part is always too big. However, I've read that you should size up for the vanishing edge because they run small and you don't want indentations. I am specifically thinking about the high-leg briefs if that matters.

I thought I might also order some of their other underwear (non-vanishing edge but still supposed to be very light and no-show) to try also, so is the sizing for that different?