Did anyone ever explain what Spock's collar was for, in Trek universe terms? Something to do with Kolinahr?
I always figured it was for warmth. He'd been living on Vulcan for the past couple of years, and now he was back on a ship whose air temperature was set for human comfort -- he probably needed to have on an extra layer until he reacclimated.
I wonder if there was a real-world reason for it?
Pretty sure it was something to do with keeping his makeup from smearing.