Edith Keeler wearing an apron
Tuvok in an apron
Cosimo wearing a half apron
An apron was an article of clothing worn by an individual to keep their clothes clean when cooking or cleaning. Red and white striped aprons were part of a candy striper's uniform. (Star Trek IV: The Voyage Home) Aprons could cover one's full body, or just the part below the waist. (VOY: "Non Sequitur")
Edith Keeler wore an apron as she greeted James T. Kirk and Spock for the first time. (TOS: "The City on the Edge of Forever")
Alice wore a white apron over her blue dress when she met Leonard McCoy on the Shore Leave Planet. (TOS: "Shore Leave", TAS: "Once Upon a Planet")
A cleaning lady wore an apron while mopping the floor outside Dixon Hill's office. (TNG: "The Big Goodbye")
The hologram Aunt Adah was wearing an apron when she was encountered by the crew of the USS Voyager aboard the Caretaker's array in 2371. (VOY: "Caretaker")
Neelix wore an apron when working in the galley aboard Voyager. (VOY: "Phage", "The Cloud", "Prime Factors")
After burning the meal she tried to prepare for Benjamin Sisko, Kasidy Yates-Sisko decided to let her husband wear the apron in the family. (DS9: "The Changing Face of Evil")
Upon enjoying Seven of Nine's attempts at cooking, Neelix commented that he might have to admit defeat and hang up his apron. (VOY: "The Void")
Tuvok wore an apron while icing a pistachio cake. (VOY: "Riddles")