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 How do I shorten a fishtail dress without ruining the shape : r sewing How to hem a prom dress, wedding dress, formal gown noelle o designs Altering this school property dress without cutting fabric since my daughter is short. : r sewing