Vintage Ralph Lauren Denim Supply American Flag Sweater Size M NWT

Vintage New with tags Ralph Lauren Denim & Supply knit flag sweater. It has a collar and 5 buttons up the front. 1 extra buttons with tag. 

It is marked a Medium, but it seems small. The bust is 33". It is 23 1/2" long from shoulder to hem and the sleeve inseam is 19". Please check measurements as it looks like a small. 

Non-smoking home. Very collectible Ralph Lauren sweater.