> Clonks only change their clothes during a game with magic help

Or in the arctic. That one scenario really is full of revelations about the nature of Clonks. ;-) But the obvious interpretation seems to be that their anoraks are a separate piece, and that the clothing underneath the anorak follows the same rules as the clothing of the normal Clonks. There's no explanation for their shrinking behaviour, though — separated from their Clonks they assume a fully grown size.

The arctic Clonks don't seem to have access to the teleportation technology normal Clonks have, can change their clothes between rounds, and can shrink between rounds, depending on how they are introduced during the next round. But that's easily explained with the theory that all Clonks in a players crew can meet between rounds, and the arctic Clonks are simply shrunk by hazard Clonks, and given access to the teleportation technology. Though that it requires explanation is a strong hint that all this stuff is an after-the-fact explanation for things that weren't considered during the game design...