BP summer cold shoulder striped sweater

BOSTON PROPER shee cold shoulder 3/4 sleeve. EXCELLENT condition nice to wear with black camisole underneath for a nice dinner date has gold sparkle threading. I don't understand why this labeled Small it is more like medium Mannequin measurements  5' 6.5" Height 38" Chest, 26. Waist 38" Hip Inseam 30.5", Neck 14", Shoulder 16