How do I shorten a fishtail dress without ruining the shape : r sewing Blue Cut Out Tie Back Layered Hem,Short Prom Dress,Boho Dress Y4696 Simplepromdress Lilac Asymmetrical Ruffle Hem Spaghetti Straps Prom Dress 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 Help!! Prom gown too long, want to hem by hand. : r InvisibleMending