Pink High Low Satin Prom Dress with Bubble Hem & Corset Bodice AS069 Viniodress How to Shorten a Formal Dress Threads Hduncf Girls Dress Asymmetric Hem Flowy Swing Dress Elegant Sleeveless Round Neck Formal Gown Irregular Hem Piano Recital Dress Gray 12 13 Years Walmart.com How much does it cost to hem a dress? Our quick answer is $60 $120 but really, it depends on the dress. , We charge by the inch of the dress circumference. The fun twirly dresses usually cost more It's Prom season, hemming formal dresses isn't too bad if you know a few tricks: Always have your model try the dress on first, wearing the shoes they plan to wear