Tail Extension on Elway Jersey

[Krsoneus]

Anyone have an opinion on if this jersey has a legitimate tail extension:

http://www.vintageauthentics.com/cgi-bin/ncommerce3/ProductDisplay?prrfnbr=103135604&prmenbr=57735959&aunbr=103482314


I can find almost no other examples of tail extensions on russell jerseys like this at other auction houses. Except for a jerome bettis jersey from a AMI auction:

http://www.americanmemorabilia.com/Auction_Item.asp?Auction_ID=32811


My concern is if this not a confirmed legitimate practice to attach tail extensions onto jerseys that have no extra length. Then it seems like a convenient way for someone to turn a "authentic" jersey with no extra length into a game worn jersey with the correct procut length.

Do teams add length to jerseys for cold wheather use in this way?

Thanks,
Kevin