Our Crossover Hoody comes in Adult sizes but the style allows for a nice fit for older girls too. Use the following chest sizes as a guide, sleeves will be adult length but the sleeve fit is nice and tailored with elastic cuffs so they stay put.
 
XS 8 Chest 28"-30"
S 10 Chest 32"-34"
M 12 Chest 36"-38"
L 14 Chest 38"-40"
XL 16 Chest 40"-42"