To choose the correct size according to your measurements, measure your body as follows.
Way to measure your shoulder width is to measure joint-to-joint from left shoulder tip to right shoulder tip. You should be measuring across the broadest part of your shoulder which usually land out roughly to 1 to 2 INCHES (2.5CM TO 5CM) blow the neckline.
Measure under arms around the fullest part of the bust. Be sure to keep tape level across back and comfortably loose.
Measure around natural waist line or the smallest part of your torso with a measuring tape.
Start from the top of your shoulders and measure vertically till your desired length.
Measure from your shoulder to just past your wrist bone to where you would like your shirt cuff to sit. Always slightly bend the elbow when measuring to allow for extra ease.