Measure around the base of the neck allowing for a comfortable fit, or measure a shirt collar that fits you well. To measure a shirt, lay collar flat and measure from button to button hole at the far end.
With arms relaxed at sides, measure around the largest part of the chest and shoulder blades.
Measure from center back at neck base along shoulder and down arm to wrist with a slightly bent elbow.
Measure around waist at narrowest point.
Measure from base of crotch down inside of leg to desired pant length.
Extra 2" added to body and 1 1/2" sleeve length.
Men's Regular 5'8" to 6'0"; Tall 6'0" to 6'4" Measurements are in inches