what do men consider as “fat” in a woman?

I’ve noticed that women seem to think that they are “fatter” than they really are in men’s eyes. What would be considered fat in a woman’s body defined by men?

Secondly, do men find bigger women attractive? I’d say Im a midsize female and feel like midsize is very unattractive (at least for me ig), wondering what men actually think?

edit: after reading these comments, i think i have a skewed mindset of what “midsize” means.