It should be measured close to the body, preferably without clothes or in underwear.

A. Chest

The chest circumference is measured over the largest part of the chest (with a bra).

B. Underbust

The underbust measurement is measured directly below the chest. 

C. Waist

The waist is measured at the narrowest point.

D. hip

The hip circumference is measured over the widest part of the hips.

E. Inside leg length

The inside leg is measured between the crotch and the floor.