The original batch of T-shirts was produced by Jonathan H N Chin.
I printed a batch of T-Shirts for shipping to UK or Europe in mid-2000. See the status page for how many I produced, and a graphical breakdown of how many of each size and colour were ordered.
On 19th July 2001 Adminspotting T-Shirts went on sale from NTK's geekstyle web site. Their licence has now expired, however.
Official Adminspotting T-Shirts were made and shipped on 30th May 2015. Baseball caps too! I invite "Expressions of interest" for further orders of T-shirts and/or baseball caps. I am happy to ship world-wide.
If you are interested, please see this page for details.