As a seamstress, that last meme is the truth. (I mean the message behind it, not literally.)
You look bad in your clothes because they are made to be cheap, not to fit your body. Modern clothing relies on stretch materials to fit around the largest possible range of bodies, not to be flattering to any body. For all of human history until recently, clothing was custom made for individuals, but that doesn't sell large volumes of clothing units so capitalism says it's not the clothes that are wrong, it's your body and your fault. You should buy more stuff.
Celebrities have clothes custom made or custom tailored. Some people just happen to have bodies close to the digital "ideal" models that are used to size clothes. But most people don't.
It's the clothes, I promise. They are made for profit, not for you.