Please refer to the sizing chart below:
3XL: Neck 19" Chest 25-27" Back Length 18"
4XL: Neck 21" Chest 27-29" Back Length 20"
5XL: Neck 22" Chest 29-31" Back Length 21.5"
6XL: Neck 24" Chest 31-33" Back length 23.5"
7XL: Neck 25.5" Chest 33-35" Back Length 25.5"