Specify the desired width of the pocket.

Measure around lowest part of neck, at the base.
This is usually the line where a thin necklace would naturally fall

Marked with elastic. Measure around the fullest part of the bust, keeping the tape level at the back.

Measure waist at the elastic tape

Measured at the level where abdomen circumference is maximum.
Be sure to keep the measuring tape level

Measured over the largest part of your bottom/thighs (at elastic)

Horizontal distance between bust apexes (also called bust bridge).
Measure along bust elastic

Measure from one breast apex to the other, around the back of the neck.
DIVIDE THE RESULT BY 2

Measure from bottom of waist elastic, up across bust apex, around back of neck, and down across breast apex to the bottom of waist elastic.

Put on a thin necklace, or drape a piece of string around your neck.
Measure from the place where the necklace falls on the back of your neck to the lower

Stand with your arms relaxed at your sides. The measurement is taken horizontally between shoulder blades, from and to the point where your arm meets your body (but not to armpit) about 4" (10 cm) from neck downwards.

Measure from neck to shoulder tip.
Shoulder tip is found when you raise your arm to horizontal position and feel where there is hollow/pit between shoulder and arm bones.
Hold your arm horizontal, if necessary, to find this point.

Measure vertically from lower edge of waist elastic to lower edge of abdomen elastic.
Measure at front center.

Measure vertically from lower edge of waist elastic to lower edge of hip elastic.
Measure at the front.

Measure the greatest circumference of your upper arm

Measure around wrist over wrist bone

Arm length from shoulder tip (as described above) to wrist.
Bend arm slightly and measure over outside of elbow.

Measure from the bottom of waist elastic to the desired length of the jacket.