70s “Life’s a Bale of Hay” Football Jersey Style Shirt

70s “Life’s a Bale of Hay” Football Jersey Style Shirt 
PTP: 20”
Length: 27.5”
Fits Like: Medium - Large??
Condition: excellent 
Info: Single stitch, Medallion brand tag, 50/50 cotton poly blend. 
Literally no clue what it means, but I love it.