Thrift store find appears on Tumblr

A very excited person posted on Tumblr about scoring a bunch of Gatchaman shirts in their local thrift store.

https://www.tumblr.com/beetleboy213/731042729454403584/various-gatchaman-stuff-i-found-at-my-local-thrift?source=share&ref=katblu42

I'm very happy the shirts have found a loving home, but I wonder who they used to belong to.

They all appear to be old Gatchacon shirts.

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"First things first, but not necessarily in that order." 4th Doctor