Presented below are some images of a rare blue medical jumpsuit worn by Gary Lockwood as helmsman Lt. Cmdr Gary Mitchell in the second Star Trek pilot "Where No Man Has Gone Before"; which was produced in July of 1965 and broadcast as the third episode of season one on September 22, 1966. This historic production was the first to feature William Shatner in the role of Captain James Kirk.
The jumpsuit features a unique caduceus-like logo which was rubber stamped in dark ink on the left chest fabric; and was actually worn by two highly memorable TOS leading guest actors. In the episode screenshots that follow the modern day images, it can be seen that Ricardo Montalban also donned this jumpsuit in the 1st season episode "Space Seed" (first airdate: Feb. 16, 1967) during his portrayal of the genetically-engineered superman Khan Noonien Singh. Interestingly, the ship designation "U.S.S. Enterprise" which is clearly visible at the base of the logo in the second pilot and in the early portions of "Space Seed" has been intentionally removed for the final appearances of the jumpsuit in that episode, and thus has taken on its modern day look.
The following photos are displayed with the gracious permission of a long time, major American collector and expert on Star Trek Original Series props and costumes; who wishes to remain anonymous ...
Some screen captures of this jumpsuit as it appeared in "Where No Man Has Gone Before" ...
and as seen in "Space Seed" ...