Tour Shirts!
 

I am sure you've seen the Goo LP Era shirts that have been cropping up among many British kids.

However, some years ago (around 5) prior to many of these shirts coming out in places such as topman I picked up a different version of the t-shrit in a local thrift store. the top is unlike the ones in the ones from topman, black as opposed to white and has a tour poster on with a similar image. The t-shirt has two dates on it one from seattle and one from portland and says that the sonics are going to be supported by "two hot bands" which are Nirvana and STP (stone temple pilots)

Can anyone shed any light on this shirt and weather it is a legitimate tour shirt?

Sounds like a bootleg made from this image: http://www.sonicyouth.com/mustang/cc/sy082390.jpg

The STP on this poster was not Stone Temple Pilots, btw.