Different body types are flattered by different clothing styles. One of the great failures of modern fashion is the idea that the thing that Hot Celebrity wore

Different body types are flattered by different clothing styles. One of the great failures of modern fashion is the idea that the thing that Hot Celebrity wore and looked good in is going to be appropriate and good-looking on everyone else; that outfit might have made them look better but make you look worse. Saying that isn't skinny-worshipping. In fact, it's almost the opposite of skinny-worshipping, because people that try to squeeze into Hot Celebrity's fashion are going to feel the need to skinny up in order to make it look good. Rather, the OP's advice is to find something that fits you and is flattering to you; tight T-shirts typically don't really look good unless your chest measurement >= your waist measurement, but there are other things that will. That's a lot different than just saying "you look bad".