Well, I wear an xsmall in most things, but when i tried on an xsmall pair of Ibex pants last summer at the Arcadian shop, wow; I couldn't get them over my hips! Of course this was on the day that I had to get off my bike and walk up part of an 18% grade hill, for the first time in my life! Then, I realized the Ibex ski-pants/tights Steve bought me are smalls. They are too long, but since they are tights, I just pull them up.
Going to take a peek at the Alpstars.