VTG 70s JC Penney Medium 15 1/2 - 32 Yellow No Iron Big Collar Mod Long Sleeve
Has some marking around the collar. See pictures for exact details.

Measurements:

Shoulders - 17.75"
Pit to pit - 23"
Sleeve from shoulder seam to cuff - 22.25"
Length down center back from collar seam to hem - 30.5"

A-11