I have the same problem. I usually have to buy my tops from lane Bryant. They aren't comfy bc I have to get the tie straps (putting all the boob weight on my neck) and even then it's kinda lose. It's worth the uncomfortableness when I know the girls are secure and I get to see the sour look from the fat attendant.   "That's right butter huffer! I'm actually curvy! I fit into your tops bc my boobies are big! Not bc they're bags of fat with ample back fat!" As for bottoms I usually wear boy shorts or male board shorts bc pockets.