I'm such a bad liar. I made that set.
It's a set I made a while ago and decided it wasn't good enough to put on sale. But I have given it away as a freebie a few times, some of the items having the wrong permissions. It was never meant to be distributed, and indeed I'm trying to sell the shirt on its own. Heh.
There is a hat and shoes that match the pieces that have been given away as freebies. I'm going to remake the set so the creator/permissions are set correctly. Since people seem to like it I'll keep it as a freebie, but as a box set from my shop above Thinkers.
If you have one of the dodgy copes of the set and would like to trade it for a set with correct permissions - and the hat - and a landmark to my shop so people can get their own copies if they like yours, drop me an IM!