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Most items have their own size chart. But if you can't find one, you can use the following charts as a general reference:

 

Dress Shirts

Regular Fit - Inches

Collar 14½ 15 15½ 16 16½ 17 17½ 18
Sleeve 33½ 33 34 33 34½ 36 33 35 36 33 34½ 36 38 34½ 36 38 34½ 36 38 36 38
Chest Size 43 45 47 49 51 53 55 57
Waist Size 40 42 44 46 48 50 52 54
Front Body 27½ 28 28 28¼ 28¼ 31 28¾ 28¾ 31 29½ 29½ 31 32 29½ 31 32 30¼ 31 32 31 32
Back Body 31½ 32 32 32¼ 32¼ 35 32¾ 32¾ 35 33 33 35 36¼ 33½ 35 36¼ 33½ 35 36½ 35 36¼

 

Regular Fit - Centimeter

Collar 37 38 39 41 42 43 44 46
Sleeve 85 84 86 84 87 91 84 90 91 84 87 91 97 87 91 97 87 91 97 91 97
Chest Size 109 114 119 124 130 135 140 145
Waist Size 102 107 112 117 122 127 132 137
Front Body 70 71 71 72 72 79 73 73 79 75 75 79 81 75 79 81 77 79 81 79 81
Back Body 80 81 81 82 82 89 83 83 89 84 84 89 92 85 89 92 85 89 92 89 92

 

How to measure:

Neck Size

Spread the unbuttoned shirt out on its back. Place one end of the measuring tape at the center of the button where the button stitching comes through to the inside of the collar band. Pull the collar tight so that any curve to the collar band is straightened. Measure straight across the collar band up to the far edge of the button hole. Round to result to the nearest .25 inch.

Sleeve Length

Spread the unbuttoned shirt out on its front. Place one end of the measuring tape at the back of the collar, exactly in the center, just below the collar band. Then place the measuring tape along the yoke and down the sleeve, until the end of the cuff. Pull the sleeve firmly away from the shirt body. Be sure the sleeve is fully extended, but do not stretch it.