argh

i tried to go shopping for some preggo clothing yesterday. i tried on a few tops that looked cute on the hanger - a sort of collared shirt in cotton poplin with a bit of stretch, which had a tie under the bust - and they were all ridiculous on. can someone please explain to me why they put the extra fabric in the back? don't most preggos put on the pounds in the front? that's what i'm doing. having big balloons of fabric puffing out the back my help if i was growing a hunch, but thankfully that hasn't happened.