Typically, your panty size is your regular clothing size. If you want to be absolutely sure, first measure your waist at the narrowest part of your torso (see area 3) and then your hips at the fullest part of your buttocks (see area 4 in the illustration). Find both your waist and hip measurements in the chart. For example, if your measurements are 88 cm waist and 104 cm hips, choose the middle size—in this case, size 44 .