Easy way to hem a prom dress. Its easier than cutting first. You sew first. , mark the hem. Subtract 1 2 for hem. , mark with chalk marker and turn to the inside on chalk marks. I hemmed 2 Beaded One Shoulder Long Cut Out Prom Dress PromGirl Black Gold 14 DIY ways to shorten a dress without sewing Strapless Polka Dot Cut Out Long Prom Dress with Bows Black White 00 How do I shorten a fishtail dress without ruining the shape : r sewing