My fave undies are cotton with lace at the top from La Senza (5/25 right now). They're higher cut than the ones you have, so they cover my largish bum But they're super comfy and I find lace at the top keeps them from digging into the belly. Had a few pairs from last summer and I just went back to buy more cause they were the only undies I was comfy in.
Re: underwear rave...