Beware of the all the fakes out there which people call "vintage". THIS IS THE REAL DEAL FROM 1975 USED TO PROMOTE JOHN LENNON'S ROCK'N' ROLL ALBUM RELEASE. I've had this in my collection for nearly 30 years and finally letting it go. 19 inches from armpit to armpit.
Note that an XL from 1975 is closer to a fitted L today. The only blemish is under the right armpit on the white part.
Looks like a pinkish color so it may be something that comes out in the wash but I'm not putting this in the wash. It may or may not come out so know that. Collectors who know will KNOW this is the REAL DEAL! Starting this very cheap for such a hard to find John Lennon/Beatles-related item.