Bust
Measure the fullest part of your bust, keeping the measurement tape at the same level all around your back and front. Make sure the measurement tape goes under your arms.
Waist
Measure your natural waistline (which is between upper waist and belly button waist) as shown in the picture. Keep the measurement tape at same level around back & front. In order to understand your waistline even better, please bend towards one side & you will find your waist's natural crease. At the crease measure around your waist.
Hips
Measure around the fullest part of your hips & rear keeping your feet together and measurement tape at the same level all around the back & front.