www.computergear.com is a good resource for computer/linux T-shirts. I wore some linux shirts that I got from here recently and I am happy to say that Linux in general and VectorLinux specifically got plenty of publicity from people asking about the shirts. Several people had not heard of Linux before.
I had a thought. Where is most Linux "stuff" (information, etc...) ? On linux/computer websites. (distrowatch.com etc...). Linux/VectorLinux needs to be put on websites that are looked at more by the general public. I know there are some videos about VL on YouTube and that's good but I think we need more videos on YouTube or other such places. Think about sites that a lot of people go to regularly. It might not be possible to put Linux/VL advertisements/videos etc. on some such sites but I'm sure there are some available places. "Freeness" and speed should probably be the main "sales" points.
just my thoughts
