The bust circumference is measured horizontally around the fullest part of the bust.
The underbust measurement is taken horizontally directly under the bust, close to the body.
The waist circumference is measured horizontally around the narrowest part of the waist.
The hip circumference is measured horizontally around the fullest part of the hips.
The inside leg length is measured from the crotch down the inside of the leg. Depending on the trouser style, measure to the ankle or the floor.
Height is measured from the top of the head to the soles of the feet (without shoes). It is best to stand barefoot with your back and heels against a wall.