(written from a Production point of view)
Robert "Bob" Fletcher Wycoff (23 August 1922 – 5 April 2021; age 98), better known simply as "Robert" or "Bob Fletcher", designed the costumes used in the first four Star Trek films. He started out in the Star Trek franchise when he was brought in by Director Robert Wise in March 1978 for Star Trek: The Motion Picture, thereby replacing Star Trek: The Original Series veteran William Ware Theiss, who hitherto held the position. (The Making of Star Trek: The Motion Picture, p. 124) He earned Saturn Award nominations from the Academy of Science Fiction, Fantasy & Horror Films for his work on all four films, winning his fourth (for Star Trek IV: The Voyage Home). Starfleet uniforms based on his designs were also used in Star Trek V: The Final Frontier, Star Trek VI: The Undiscovered Country, and Star Trek Generations as well as in scenes for Star Trek: The Next Generation and Star Trek: Voyager.
Fletcher was also responsible for the "look" given to the Klingons and Vulcans in the Star Trek films, elements of which have been used in almost every subsequent Star Trek series, including the Klingon cranial ridges that were first adopted in Star Trek: The Motion Picture. In addition, Fletcher designed the full set of rank pins used in Star Trek II and beyond. Paramount obtained several design patents based on Fletcher's work, where he is listed as the "inventor" of the design.
In 2007, Fletcher also worked as costume designer for the Starfleet uniforms for the fan-made internet series Star Trek: New Voyages episode "World Enough and Time", which features James Cawley, Jeffery Quinn, George Takei, Grace Lee Whitney, Majel Barrett Roddenberry, and John Carrigan.
Career outside Star Trek
Prior to his involvement with Star Trek, Bob Fletcher accumulated set, and costume design credits for predominantly television productions such as NBC Television Opera Theatre (1955), Stanley (1956), General Motors 50th Anniversary Show (1957), Music with Mary Martin (1959), The Hollywood Palace (1967-1968), A Family Thing (1968), and The Scarecrow (1972). A single movie credit, prior to The Motion Picture, was Sam Peckinpah's 1970 western The Ballad of Cable Hogue.
In addition to his Star Trek work, Fletcher designed costumes for the later films Caveman (1981), The Last Starfighter (1984), and Fright Night (1985). He also worked on the epic mini-series North and South, Book II (starring Kirstie Alley, Mary Crosby, Jonathan Frakes, Jim Metzler, Jean Simmons, Kurtwood Smith, David Ogden Stiers, and Anthony Zerbe), for which he earned an Emmy Award nomination for Outstanding Costume Design for a Miniseries or a Special. The Costume Designers Guild honored Fletcher with a Career Achievement Award in 2005.
North and South and The Voyage Home were his last motion picture contributions before his retirement.
Aside from the motion picture industry, Bob Fletcher also worked extensively for Broadway musical and theater productions, earning him three Tony Award, and one Drama Desk Award nominations, though not winning any of them.
Fletcher passed away peacefully on April 5, 2021 in his home in Kansas City, Missouri, at the age of 98. 
Star Trek interviews
- "Bob Fletcher: Costume Designer, Outfitting the Crew of the Enterprise", Karen E. Willson, Starlog, issue 33, April 1980, pp. 48-53, 71
- The Star Trek Interview Book, 1988
- "Behind the Scenes: Star Trek II Costumes", Star Trek: The Magazine Volume 3, Issue 5, September 2002, pp. 92-95
- Star Trek II: The Wrath of Khan (The Director's Edition) DVD special feature, "Designing Khan" (2002)
- "Spray-and-Wear Clothing", Chapter 11, The Making of Star Trek: The Motion Picture, March 1980, pp. 122-133