RIP.
Oh that episode, the very first time travel one I do believe.
“Actor Roger Perry liked his Starfleet uniform so much, he asked DeForest Kelley if he could take the shirt home. Kelley replied, “Well, they frown upon that. But you could possibly just stick it into your bag, and nobody’s going to say anything.” Perry decided not to do that, but after seeing the eventual success and legacy of Star Trek, he regretted he didn’t take the shirt home. (These Are the Voyages: TOS Season One, p. 428)”
RIP