Or "hobo mitts" as Title 9 calls them? I've seen lots of sports gear with the extra long sleeves and a hole for your thumb, and I love it. It gives me the same feeling as BF jeans - like slouch for your hands. Not to mention quite practical for me.
http://www.titlenine.com/produ.....Hobo+Mitts
if you see any dressier sweaters with this feature, I'd love to see them!