The measurements may be the same, but people are seldom truly straight up and down. Look for some belly protruding to the front and some rump protruding to the rear -- if you have Barb's book, go back to the part about splitting waist and hip measurements between apron side and pleat side. You may want to put more of the waist measure into the apron side. Then, even if your hip measure is split 50/50, you will have a taper between bottom of fell and waist.

Hope this makes sense!