Size S: Neck circumference: 4.3–6.3 in, chest circumference 5.9–7.9 in, chest and back length 3.7 in M size: Neck circumference: 5.5–7.1 in Bust: 7.1–9.8 in Chest and back length 4.1 in L size: Neck circumference: 6.3–7.9 in Bust: 7.9–12.6 in Chest and back length 4.8 in XL: Neck circumference: 7.1–11.8 in Bust: 9.8–15.7 in blue, back length 5.1 in