Your weight and looks

Here’s the thing, I’m a married woman who is grateful to have met her husband when I did. I was at a wedding and overheard a few girls talking about their looks. One was complaining to the other how her top made her look “fat”. People if you are a size 4 which she was you can wear a shamteh (old worn clothing) and still not look fat. Trust me I’m no size 0. Why does everyone desire to be stick skinny? Why can’t you desire to be healthy in your own body and skin?