Plumpness, as you call it, was in fashion a hundred or so years ago. If you look at the paintings and such from then, it's clear that womanly curves were highly cherished. I believe it was because this usually meant that the family provider (often the man) was able to provide in a way that were was excess wealth. The skinny women that were tan (I should mention that fair skin- not tanned skin was seen as most healthy and desirable as well) were women that had to work out in the fields, etc. Therefore, they were not considered the ideal.

You can even see that curves were appreciated up til the 1950's and 1960's. Marilyn Monroe was a size 12 or 14 (I forget). Now granted, sized have shifted as well - a size 14 then is probably a size 12 now. It wasn't until Twiggy that super skinny became the fashion forward. And now size 14 models are considered "Plus" rather than just normal. (Considering a majority of women fall in the 12-14 range).

So for plumpness to be fashion forward, it would actually be retro. I think there is a slight shift in this direction now and hopefully into the future. And like Vic, I'm already the retro fashion forward. So, I'm ready when the rest of the world sees me as the goddess I am (tiny bit of sarcasm there).