This is a Polo Ralph Lauren lace up jumper in a size medium, this has been well worn and shows signs of wear including some stretching/being misshapen and marking which I have tried to picture as accurately as I can. 

Approximate measurements:

Pit to pit: 22.5 inches 

Back neck to hem: 24.5 inches 

Sleeve (underarm to cuff): 20.5 inches 

Any questions you have please do ask!

Thanks for looking and check out my other items :)