BUST: The circumference of the bust should be measured from the front through the most convex point of the bust, just below the armpit, from the back slightly upwards.
WAIST (WAIST): Waist (waist) is measured at the narrowest point of the waist (above the navel), in a straight torso position, after exhalation and before re-breathing.
Do not strain your muscles, but do not pull your stomach. Under Armor size can always be a bit larger than other sportswear. Keep in mind whether it's a fitted or loose collection.
HIPS (HIPS): The circumference of the hips is measured at their widest point, in a standing position, buttocks muscles relaxed, feet joined together, toes pointing forward.