Even if you’re planning on dropping 15 pounds before your wedding, your
body type isn’t going to completely change just because you started
swapping cookies for carrots. So you’ll want to buy a dress that fits
your body the way it is now. It’s a lot easier (and cheaper) to have a
dress taken in than it is to add extra fabric to a gown after the fact.
Wedding gowns can run small too, so don't be alarmed should your final
size measurement jump up a number or two. The store will measure your
bust, waist and hips. After the final fitting, make sure that the hem
(if it’s a full-length gown) skims the toes of your shoes, you can move
comfortably, the gown stays in place as you move and there’s no obvious
wrinkling, bunching or pulling.