Bust: Not your bra size! Take the tape around your back and bring it across the fullest part of your bust. Your arms should be relaxed, down at your sides. You must wear a bra when taking this measurement.
Waist: This is the smallest part of your waist. Typically it's an inch or so above your belly button. Also known as the natural waistline.
Hip: This is the widest part of your hips, across the hipbone. Measurement is taken approximately 7 inches below the natural waistline.
Hollow to Hem: Start the tape at the hollow at the base of your neck and measure down to where you want the hem. If your skirt will be full, be sure to measure out at an angle to allow for the fullness. Also, be sure you're wearing the same height heel you'll wear on your wedding day.