Una, I thought about this some more.
I think our feminist sensibilities sometimes conflict with our biological programming. Here's the thing: we want autonomy, choices and control over our lives. Everybody wants those things, and as women, given the fact that historically those things have been unavailable to many of us, we are perhaps a little extra sensitive when we are feeling judged for our choices, or if we feel our autonomy is diminished by being told what wear to by someone else -- especially when that someone else happens to be a man. I get that.
On the other hand, we ALL -- men and women alike -- enjoy feeling attractive. That's the biological programming bit. And because women are almost certainly judged more for physical beauty than men are (again, probably a function of biology, but something that culture can modify and perhaps overcome), it's natural that we get our backs up more when being told what we should look like.
I think the trick is to remember that attractiveness is so, so subjective. Some women are heavier than others. Cropped pants and floral muumuus accentuate plumpness. But, y'know, contrary to what media images suggest, there are a lot of people who find full-figured women attractive.
Of course, although you clearly have mixed feelings about your personal shape, I should point out that nobody would identify your figure as a full one.