I've noticed that myself. It doesn't look like a hockey jersey to me. The sizes are wrong, the arms look too small and too short, the texture of the material is wrong.
In fact, I'd say it looks like a mock up, a jersey from some soccer team, that someone added the St. Louis logo onto the shoulders as a joke. Notice that Cool Cat, the rejected mascot isn't wearing the jersey, he's wearing a normal one.
Does anyone from St. Louis have any actual evidence that this was the rejected jersey? Or is it just the case that this picture surfaced, and everyone assumes it's correct?