I received this answer from one of my contacts, a long time executive at Southland:

Yes, Warren. As I recall the story, when NO got their franchise in 1967, an asst eqpt mgr for the Cowboys got the job for the Saints. Southland made the game jerseys for the first couple of years. The one on Ebay is definitely ours. As to whether it is "game wore" is another question. It could have been but I can't say positively.