The collar measurement should be taken from the outer edge of the buttonhole to the center of the collar button when the collar is spread flat.

Measure across the shirt from edge to edge. For Chest, make sure you measure from the corner seam.

Measure from the seam at the top of the shirt down to the edge at the bottom of the shirt. This measurement is normally longer than your sleeve length.

Armhole: The arm hole measurement should be taken as a straight line from the shoulder/sleeve seem to the lower corner where the sleeve meets the body.

Bicep: Measure straight across the bicep, and start 3 inches down from the armpit seam.

Sleeve Length: The sleeve length measurement should be taken from the shoulder/sleeve seam along the upper edge of the sleeve to the edge of the cuff.

The shoulder width measurement should be taken between the shoulders at the sleeve seam.

The cuff measurement should be taken when the cuff is spread flat. Measure from the outer edge of the cuff button hole to the center of the button.