OK Kano, you are right, of course.
So I am 5'5", 140 lbs, a definite pear shape, with A-B cups. Most times, Medium fits me very nicely and smoothly, if we are talking stretch fabrics.

But alas, if i went by most of the sizing charts for biking pants, I'd be ordering XL(!) and suffering with baggy knees and baggy crotch and loose waists. But the hips might fit "ok". I'll stick to the mediums...