I voted yes, but now I think I've changed my mind. That might be a little strange getting a gift from someone you barely know, that you've only spoken to over the internet. Also since sizes can run so differently, the only way to truly know someone's sizes would be to measure bust, waist, and hips, as someone pointed out earlier. Unfortunately, providing this information poses the possibility of attracting perverts, since these measurements can intimately describe the curves of your body.
If it could be only available to people who watched you. Even though I have since lost A LOT of weight, it is still a sensitive aspect of my life. I also believe half of the beauty of an online art community is the art without influence, people cannot judge you based on you, only on your art. Not your appearance, but the way you present yourself, whether it be on paper, film, or a digital format.