This costume was one of 2 known examples worn by actor William Campbell as Trelane in the 1st Season TOS episode "The Squire of Gothos" (original airdate: Jan. 12, 1967). In 2013 I acquired two copies of this costume, giving one to the CBS Star Trek Archive. There is an unconfirmed rumor that there is a third copy that William Campbell himself owned.
My good friend Gerald Gurian, took these photos last year when I displayed these costumes at the Creation Star Trek Las Vegas Convention. I am a firm believer in displaying my collection for all to see. Sharing my and other collections through this blog is part of the joy I get from collecting.
Thanks to Gerald for the photos!