@ knotted - from one hugely fat girl right now to another...LOVE IT!

I love clothes - PERIOD. No matter the when or where. But I really don't care what anyone else is wearing while they ride. I do find cars are nicer to me if I'm in street clothes on my commuter with my wicker baskets, but I haven't noticed a difference from cyclists here in the Denver area. The only time I've ever gotten comments is when riding in an organized ride in what I call "self supported" on my commuter from other "hard core" roadies. Little do they know I actually get paid to ride a bike! I do race, and I do just ride for the hell of it, and I wear what I want, when I want depending on how I feel and I don't care what anyone else thinks. Yes, I've ridden 50+ miles sporting flat pedals with a rear rack and a (gasp!) BASKET! And I looked cute, too
I'm not afraid to get dirty and spandex doesn't intimidate me - neither do 4 inch heels. Wear what you want - wave if you feel like, and don't take offense if people don't wave back.