HOW TO MEASURE
How to measure Bust : Wearing your bra and with your arms relaxed at your sides, measure the fullest part of your bust, keeping the tape parallel to the floor, under the armpit and around your back at about the same location as the middle of your bra-line.
How to measure underbust : Measure all the way around your torso immediately beneath your bust
How to measure natural waist : Measure around the narrowest part of the natural waistline. To find your natural waistline, bend to one side. There will usually be a crease where you bend. Often it is just below your rib-cage. That's your natural waistline. Don't worry since this may seem higher than where you actually wear your pants and jeans. But this is the point that is so important for a great fit. Try to keep the tape measure parallel to the floor as you measure all the way around your torso. That's your natural Waist Circumference.
How to measure upper hip : Measure at or just below your hip bone. Just above where you bend when you sit.