You might be right, fifexile, but the sky blue top in the picture (and others that I've seen) has a maker's logo; also, the Thistle crest is on the left side, not in the centre. And I have a vague memory of seeing a "reversed" version of the yellow top with red trimmings, and the players also wearing blue shorts, eliciting bemusement and varied opinions among supporters.
A fair number of Jags legends in that photo!