For Chest - Measure 1" inch below armhole, from seam to seam across chest. For Length - Measure from shoulder to bottom of shirt.

Small - Chest 20" - Length 27"

Medium - Chest 22" - Length 28"

Large - Chest 24" - Length 29"

XL - Chest 26" - Length 30"

2XL - Chest 28" - Length 31"

3XL - Chest 30" - Length 32"