Use a measuring tape to measure the following areas to find the best size.

Neck

Find the circumference of your neck making sure to leave room for a one or two-finger margin. Round to the nearest half-inch.

Chest

Beginning an inch below the armhole, measure around the circumference of the body making sure to cover the broadest part of the chest. 

Waistline

Measure around the narrowest part of the torso.