Take your measurement
Measure under your armpits, around your shoulder blades, and over the fullest part of your bust. Don't pull the tape measure too hard. For fitting a bra, you also need the measurement just under your bust.
Measure around your natural waistline. This is the narrow part of your waist, about an inch above your navel. Relax and breath out before you measure.
The hip should be measured around its fullest part (about 8 inch. below your waist).
This is the measurement from your ankle to your groin, when you stand with your legs straight. If possible, ask a friend to help you. This can also be measured on a pair of pants with the proper length.
Use the tape to measure around the base of your neck, where it meets your shoulders. Put a finger between your neck and the tape measure for a more loose fit collar.
Bend your elbow and put your hand on your hip. Ask your friend to measure from middle of back of your neck, around shoulder and elbow to wrist bone.
This measurement should be taken beneath your armpits, around the widest part of your chest and shoulder blades. Make sure to keep the tape measure horizontal, and don't pull to tight or hold your breath while measuring.
Put the tape around your natural waistline, which should be close to your bellybutton. Put one finger between the tape and your body before you measure.
This is measured between your groin and your lower ankle. You might find that is most easily measured on a pair of pants that already suit you.