The Starfleet Uniform was used in Star Trek: The Motion Picture (1979). This was the main attire for the Enterprise crew during the first movie directed by Robert Wise.
The Class-B uniforms which were designed by Robert Fletcher, are more casual, with either long or short sleeves. The uniforms are worn daily around the ship. There are three uniform colors in Star Trek: The Motion Picture (white, brown, beige). A white shirt and grey pants are worn by command level officers, and the lower officers wear beige. Enlisted personnel wear light and dark brown.
These uniforms wore rank insignia on the sleeve or on shoulder tabs. The arrowhead emblem was adopted as Starfleet’s overall insignia and was worn on the chest by shipboard personnel and flag officers. The insignia worn here on the breast match the tabs in color (Red: Engineering and maintenance). The Rank is indicated by stripes, except for the yellow squares worn on the tabs of Chiefs.
The uniform is accompanied by a attached bio-monitor prop. It’s made of plastic, the interior is filled with foam and a back panel holds into place a pair of elastic strips with dried glue residue.
Screencaps: Trekcore.com / © CBS Studios Inc. , Paramount Pictures