Julie Newmar was the first actress to protray Catwoman on the Adam West Batman TV show. She made her debute on March 16, 1966. It is said that she designed and made her own costume. ("The Purr-fect Crime", Batman, TV, Event).
No trivia for this one, unfortunately. Since this is a side-poll running concurrently with the Quarter-Finals, I would have likely ended up repeating my already-written trivia (especially since I'm coming up a bit short for Meriwether's version at this point) but I did want to do something like what I did with the Freezes in the preliminaries, so here you are!