What is considered Curvy, Skinny, and fat? And what would you prefer?

What makes you consider someone curvy, skinny, or fat? Also when does curvy just turn into being fat or chubby? And what do you prefer someone that is curvy and thick (not fat but thick) big boobs, thin waist, wide hips, or someone that is skinny or athletic, maybe even a little bit petite, small- medium boobs thin all around, or do you like someone is on the chubby/ fat side?
( I know personality can over come someones appearance but if you where to first judge by someones appearance, what do you prefer?)
What is considered Curvy, Skinny, and fat? And what would you prefer?
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