The last I heard Big Foot was spotted wearing one.
In the early days old kit was either ditched or used as training gear. Clubs today are more aware of the value of club memorabilia and usually sell it on ebay to raise money for things like youth development. A few players from that era would have been allowed to keep the shirts, however, I would imagine the majority of kit would have been left with the club. I know the kit man at Motherwell has a large selection of match worn tops, he just might have one in his collection.