...or something? i see it all the time. for example, when i watch the 2007 Duel in the Pool 4 X 100 medley relay, all the australian swimmers and american swimmers are wearing big shirts. the "short" sleeves go up to their elbows! it totally doesn't fit. does it help them keep warm or something?
here's an example, first 20 or so seconds:

http://www.youtube.com/watch?v=hVFI3klhkiM