Bridesmaid Dress Alterations 101: Cost, Timing & FAQs 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 Petite women if youve ever skipped maxi dresses because theyre always too long, same., These are actually petite sized, which means the length is finally right without hemming., Which one do you How to Hem a Bridesmaid Dress: Step by Step Guide for Flawless Results