I got this info from CS and thought I'd pass it along if anyone was interested in ordering the Club Jacket for girls:

Chest/bust
Size S (7-8): 33-1/2"
Size M (10-12): 36-1/2"
Size L (14-16): 39-1/2"
Size XL (18-20): 42-1/2"

Waist (relaxed)
Size S (7-8): 26"
Size M (10-12): 28"
Size L (14-16): 30"
Size XL (18-20): 32"

Sleeve length (from center back of neck excluding cuff length)
Size S (7-8): 23-1/2"
Size M (10-12): 26"
Size L (14-16): 28-1/2"
Size XL (18-20): 31"