size - Medium (but looks large to me)
 
https://www.rockinrelics.com/products/zz-top-fandango-tour-shirt-1975-rare?variant=39508261699619&currency=USD&utm_medium=product_sync&utm_source=google&utm_content=sag_organic&utm_campaign=sag_organic&srsltid=AfmBOoo48XKjn2-oYBOP4mS_To713oFMv-jc7a72jYD7Jw7U0CTrqGtk1Cc