Sizes Bust Measure around your bust & back at the fullest part of your bust. Waist Measure around your natural waist (narrowest part of your waist). Do not suck-in! Your waist should be about 5-6 inches from bottom of bust. Hips Measure down 5-6 inches from your waist, at the fullest part of your hip. Waist to Hem Length from waist to floor/bottom of dress. It's best to wear ideal height of heels while measuring. Tips for Alterations -The waist is generally easy to take in. -Most dresses can be taken in 1-3 sizes & let out 1 size (depends on seam allowances). -Bust & waist are usually altered for best fit. -Length is very important. It's very difficult to extend the length, unless there is extra fabric tacked down.