I used to wear sleeveless T-shirts all the time on court, but now I've got a brand new look - I've moved on to polo shirts. Sleeveless T-shirts give you real freedom of movement and they keep you cooler in matches, but I just thought it was time for a change.
It is no longer enough to play very well. You need to be able to give an answer at all times and everywhere. You cannot hide. This has something to do with maturity, and that is something you only acquire over the years.