Womens Vintage Rainbow Striped Short Sleeve Shirt

Vintage rainbow striped button up short sleeve shirt. No care tag, but fabric feels like lightweight cotton. Boxy fit. For reference, the mannequin is a size Small, so I think this could fit a Small or Medium. Please see measurements below for accurate sizing. In good vintage condition. Light wear and a tiny spot (noted in photo.) No other noted flaws. Measurements laying flat: Chest: 21.25” Length: 25” Sleeve: 9”