Here's a great kids' USA Ski Team jacket/vest with zip-off arms from Spyder.

Tagged size: Youth 18

Measurements laid flat:
Shoulder seam to shoulder seam: 19"
Chest from pit seam to pit seam: 20.5"
Height from center of collar seam to bottom of back: 27"
Arm length from center of collar seam to end of cuff: 33"
Arm length from shoulder seam to end of cuff: 24.5"

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