To choose the correct size for you, measure your body as follows:
Measure the space between your shoulder points. Position the end of the tape flat against your back at the first shoulder point. You should be measuring across the broadest part of your shoulder which usually land out roughly to 1 to 2 inches below the neck.
Measure the circumference around the fullest part of your chest, be sure to keep tape level across back and comfortably loose.
Measure around the slimmest part of your natural waistline – above your navel and below your ribcage.
Hip measurements do vary between petite and tall ladies. But usually, 20cm down from the waistline is advisable.
Start from the top of your shoulders and measure vertically till your desired length.
Your torso is the main part of your body, and does not include your head, arms, and legs.
The part of the human body below the ribs and above the hips, often narrower than the areas above and below
Your hips are the two areas at the sides of your body between the tops of your legs and your waist a measurement around the hips at the level of the buttocks used in clothing.
crotch is the part of the body between the legs where the legs join the torso, or the place on a pair of pants where the front & back rise panels meet, or the angle formed when two parts join together.
Knee measurements are taken usually 14″ down from the crotch seam.
Inseam is the inner length of the pants – measured from the point in the crotch where both leg seams meet down the inner seam of the leg to the bottom of the hem
Outseam is the outer length of the pants – measured from the top of the waistband, down the side to the bottom of the hem
The opening at the bottom of Trouser/Pants, which varies depending on the styling for the leg opening, measure across the bottom of the leg at the opening.