Damn good question. Perhaps tradition??
I would have to think that is a school decision.
Vol girls are hot, need to venture out a little more.
OR
Oregon has Nike.
Tennessee has Adidas.
For the record, Adidas America is HQ in Portland not more then 15 miles from the Nike campus so I joke about the Nike v Adidas thing. I wear both interchangably.
Oregon Cheerleaders have always had short little skirts going back to the 80's.
If you have seen the movie Elizabethtown, that opening scene where he is flying the Helo through Downtown Portland lands in front of the Adidas Campus just outiside of Downtown Portand.
Anyways, Under Armor and Adidas are always playing catchup to Nike but when it comes to "Uniforms", all the new stuff and stuff no one ever see's starts with Oregon.