This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. A usually long-sleeved, collarless, oversize pullover made traditionally of heavy cotton jersey that has a fleeced backing.

n. A loose shirt, usually made of a knit fleece, for athletic wear and now often used as casual apparel.

n. A shirt worn against the skin, usually under other clothing, to absorb sweat.

n. cotton knit pullover with long sleeves worn during athletic activity

"The striped Motocross Apparel sweatshirt is another classic addition to have in your wardrobe."

slipover    pullover   

undershirt   

T-shirt    turtleneck    Windbreaker    jumpsuit    undershirt    sneaker    cardigan    khakis    raincoat    smock