That's what I've heard. I believe someone (Semptress?) described corseting a Uniquely form as taking extreme persuasion.

I'm not really sure I agree with selecting a form based on hip size, since nothing I sew is really dependent on fitting nicely through the hips. I don't like form-fitting skirts, and once you've got a bumroll or bustle in place, it doesn't really matter what your hip measure is. I'd rather select a form based on shoulder shape and measurement.