This is one of the two outfits, which were worn on screen by Leonard Nimoy in his role as Spock in Star Trek V: The Final Frontier (1989) during his conversation with Kirk at the mountainside in the Yosemite National Park.
It consists of a denim jacket with fluorescent green accents and a square shaped hole created in the front for use around a harness and a purple and black Dickie with matching fabric scraps and gray colored scraps.
For the first scenes, when Kirk (William Shatner) and Spock are talking in a side view, Nimoy stood on a moveable teeter-totter. For the further scenes, the production team installed a pole at the fake rock wall made of fiberglass, attached one end to a body suit Nimoy was wearing under the outfit and moved the pole up and down.
About the Designer
Nilo Rodis-Jamero was the leading artist for the costumes used in Star Trek V: The Final Frontier. He worked at ILM in the 1980s. He served as a visual effects art director on The Empire Strikes Back, Raiders of the Lost Ark and Star Trek III: The Search For Spock. He is credited as the designer of the popular Klingon Bird of Prey first seen in Star Trek III. He went on to work as a costume designer for Return of the Jedi and as an art director on Star Trek IV, V and VI. When William Shatner saw the detail that Rodis put into his storyboards for Star Trek V: The Final Frontier, he hired him as a costume designer. He shared those duties with Dodie Shepard.
Usually it is a lot of work, but sometimes you're just lucky and able to find enough small details for a comparison between your item and the one on screen. When I had a look at the back side of Spock's Denim jacket I was more than thrilled about all the recognizable areas of the fabric, which are absolutely unique - just like a human finger print. For a clearly screenmatch you can compare the photo of the jacket (left) with a screencap from the movie below.
Publicity Shot for Star Trek V: The Final Frontier
Scene from Star Trek V: The Final Frontier
Text Source: Memory-Alpha.org