This vintage Christian Dior pajama top is Mens size XL. Crafted from 55% cotton and 45% polyester this long sleeve shirt was originally sold as a set of shirt + pants. Listing is just the shirt. 

Shirt Features: 
Measurments (measured flat as in diagram above) are: 
Length: 30
Pit to Pit: 25
Sleeve*: 33

*sleeve measurment = center collar to tip sleeve

Thank you for looking at my listing, please feel free to message with any questions and I will do my best to answer them.