Used most commonly when they want to call someone fat without actually saying the word; the word curvy seems to be some kind of media code to hint that someone isn't of the usual skeletal proportions we are used to seeing in high fashion. But why? just because someone has curves in the appropriate places, doesn't mean that they are any larger than average; likewise you can see a 'plus-sizer' who seems to be completely straight up-and-down. I hope these guys can help illustrate my point:
Lana Dey Rey is beautiful beyond measure, and in real life is a miniscule size 6, but there's no denying she ain't got the curves.
This is the woman of the hour, and with curves like that, you can see why, but in a recent interview for The Guardian she said that she was told to lose weight for a role, to which she politely pointed out that she is already a UK size 8, and she can't help her shape...
And on the flipside we have the undeniably gorgeous Sara Ramirez, who is a larger dress size than one usually sees in Hollywood, but doesn't particularly fit the description of 'curvy' in its literal sense.
One hears a lot in the media of celebrities who endorse being 'proud of your curves' and a positive self-image, but I fail to understand why anyone would ever be ashamed of their curves? I can see why someone might feel insecure if they were bigger than they would like to be, but not curvier. They are two different things, and it is completely beyond be why these two terms are used interchangeably. Being big and being curvy are not the same thing.