Unless you're knitting a dress or a very long sweater, the hip size wouldn't enter into it much. The patterns should have schematics that show the lower edge measurements, or you can figure them out from the number of sts there divided by the sts/inch in the gauge. Even if knit from the bottom up, the lower edge wouldn't hit at the largest part of your hips. So figure out how long the sweater is on you and CO for a size that will fit you at the point, then decrease sts gradually as you go up. If there's waist shaping, don't increase as much as you would normally.
sue- knitting heretic