Our team wears team t-shirts every day. In past years, we have had 3 different shirts - one maroon, one navy, and one black (our team colors) - but other teams found that a bit confusing.
This year, we decided to use a gray base and print our logo and our sponsors navy, maroon, and black. We have our sponsors on our backs every day (they enable us to participate in FIRST, and we believe they deserve the recognition). We also put our team number in binary on the bottoms of our shirts, just for fun
This year the Saturday of the Utah Regional falls on St. Patrick's Day, and in commemoration of that, we've decided wear shirts with a green logo partially made with shamrocks. I can post pictures later.
On a side note, in 2010, our school's multimedia teacher made our shirts in illustrator and accidentally left out one zero in our binary number xD Instead of 2993 (101110110001), we were 1497 (10111011001)