Get a relaxed fit jacket by picking your standard shirt for a relaxed look
Lay the jacket down on a flat surface. Measure it from the bottom of one armhole to the bottom of the other armhole (the widest part of the jacket) and double the number to find the measurement.
Hold the measuring tape 6 inches below the armhole of your jacket to determine your waist. Measure across, from one end to the other end and double the number to find the measurement.
