Chest/Bust — Keep the tape parallel to the floor and measure around the fullest part of your chest/bust. Use this measurement for tops and dresses.
Hips — Measure the fullest part of your hips standing with your feet together. Make sure to measure over your buttocks as well.
Inseam — Measure from the crotch to the inside seam of the leg while wearing your best fitting pair of pants. Wearing shoes is recommended to make sure the length is correct for you. Measure to the 1/2".
Neck — U.S. dress shirts use inches for neck measurements. Wrap the tape around the Adam's apple. Make sure the tape is consistently level all the way around your neck.
Tip: Keep the tape snug but not tight. For accuracy, measure over light clothing and have someone help if possible.