Re: Team Shirts and sponsors
 

The idea of printing the sponsors on the shirts is an excellent practice IMO.

Something to consider is that sponsors change and it costs money to print t-shirts every year. My team re-uses (year after year) our 2 t-shirts and 1 polo that we wear to every event (It might even be considered GREEN). We have three shirts because we feel that most people appreciate the ability to change shirts each day at the competition. Because of these practices, our team does not print sponsors on any of our shirts.

Re: Team Shirts and sponsors
 

When I was a freshman and had only one team shirt I would wear another shirt under my team shirt and I would take my team shirt off upon arrival at the hotel.
Now that I have four shirts I wear them in an order that allows our current sponsors to get the most recognition by wearing shirts that list them as a sponsor on days when the most people are watching. I wore my 2010 shirt on the practice day (Thursday) since that doesn't really rob our current sponsors of publicity terribly much, especially since some of them are on that shirt anyways. On Friday, I wore my 2011 shirt (which I think actually has an extra sponsor on it, and nobody is left off). Then, on Saturday I wore this years shirt to have the most up to date list and the newest shirt on the day when the most eyes are watching. I was forced to get my 2009 shirt out after the competition concluded for the day on Friday because Boston was uncharacteristically hot this year.

tl;dr --> Even if your sponsors change from year to year you can still give them the recognition they deserve by properly planning your wardrobe schedule.