Dr. Seuss Green Eggs and Ham Shirt Size S, not market but measures 18” from armpit to armpit. 24” long, AS IS. Worn & Faded = great vintage tee. Armpit - armpit, measures 19" Total Length 24. Short cap style sleeves. 

I think it’s made by DOE, No size inside.

I purchased this years ago in Santa Barbara at an estate sale.