Hello, for size M, the back length measurement is 69 cm from the middle of the back (excluding the collar). One-sided chest measurement is 50 cm, one-sided hem measurement is 50 cm. For size L, the back length measurement is 71 cm from the middle back (excluding the collar). One-sided chest measurement is 52 cm, one-sided hem measurement is 52 cm. For size XL, the back length measurement is 72.5 cm from the middle back (excluding the collar). One-sided chest measurement is 55 cm, one-sided hem measurement is 55 cm. Thank you for your interest.