Plump. Curvy. Or, my personal favorite section of girls' clothing, "husky." (Yes, it still exists.)
There all sorts of ways to euphemize the weighty issue of surplus body fat (there's another!). Overweight is probably the most accurate and least sugarcoated, but "fat" may be the most oft used, at least in unmixed company. And by that I mean among thin people.
Although a study reported that fat celebrities are normalizing obesity, I wonder if this is even possible. Susie Orbach, author of Bodies and Fat Is a Feminist Issue, has said that part of the problem is that the word "fat" has been moralized. Fat is not a neutral term, but rather a condition to be scorned and derided. Could fat ever be a neutral term?