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.
Chest:
With arms relaxed at sides, measure around the largest part of the chest and shoulder blades.
Sleeves:
Measure from center back at neck base along shoulder and down arm to wrist with a slightly bent elbow.
Waist:
Measure around waist at narrowest point.
Inseam:
Measure from base of crotch down inside of leg to desired pant length.
Men's Tall:
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