Measurements taken in inches, lying flat:
SIZE XS
Shoulders 12.5+
Bust 13.5+
Size 12.5 to 14
Sleeves 12.5
Back length 23
SIZE S
Shoulders 13+
Bust 14+
Size 13 to 15
Sleeves 13
Back length 23.5
SIZE M
Shoulders 13.5+
Bust 15+
Size 14 to 16
Sleeves 13.25
Back length 24
SIZE L
Shoulders 14.25+
Bust 16+
Size 15 to 17
Sleeves 14
Back length 25