Measure the circumference around your natural waist and your lower waist two separate measurements. Free body measurement chart for you.

Choosing Sizes
Body measurement in inches. This body shape describes a person who has hip measurements greater than their bust measurements. The waist is defined as the narrowest part of the body between the hips and ribs. The natural waist is the smallest point of your waist unlike where clothes waistlines are located these days and is usually an inch or two above your bellybutton. Calves measure around the largest part of your calf flexed or not flexed just do it the same each time. Measure the circumference of the fullest part of your thigh. Your lower waist is the widest part of your waist usually at the bellybutton or just below where weight.
Thighs measure the circumference of the the fullest part of your thigh usually about three inches from your crotch. Why i like body part measurements over the scale. Below is a free body measurement chart you can copy and print out to keep track of your measurements. This body shape describes a person who typically has waist measurements that are less than 9 inches smaller than the hip or bust measurements. You may be tempted to cheat by lowering the tape measure a few inches but then you wont get an accurate measurement. Hourglass x shape triangles opposing or facing inwards.
The ideal waist size for a woman is 32 ½ inches 825 cm while for men it is 35 inches 889 cm. Be sure to put down the date you are first measuring. Wrap the tape measure around your thigh from front to back and then around to the front. Then every two weeks re measure yourself and write down the date the measurements and whatever the change is or in inches. Hips measure around the widest portion of your hips. Pear spoon bell or triangle.