I love Snorg Tees as a company. I don't have this T shirt - I have their Sherlockian and Back to the Future ones - but I wish I did!
Buy it here:
http://www.snorgtees.com/t-shirts/geek-nerd/bow-ties-are-cool
This is their Sherlockian T shirt that I have and that I love and that is probably my favourite Sherlockian T shirt of all time. Sadly it is no longer available.