Q wearing a necktie
Dunbar wearing a necktie
A necktie or tie was a piece of formal clothing worn by businessmen on Earth in the 20th century, but continued to be occasionally worn for over a thousand years later afterward.
In 1996, H. Dunbar wore a necktie. (VOY: "Future's End, Part II")
High ranking Starfleet officers such as vice admiral Maxwell Forrest wore a necktie as part of their uniform. (ENT: "Fortunate Son")
When Q appeared as a USMC captain to the crew of the USS Enterprise-D in 2364, he wore a necktie matching the color of his uniform shirt. (TNG: "Encounter at Farpoint")
Many of the characters of the Dixon Hill series wore neckties including Dixon Hill, Carlos, McNary, and Dan Bell. (TNG: "The Big Goodbye")
The piano player at the Bourbon Street Barn wore a necktie. (TNG: "11001001")
Retired Admiral Jean-Luc Picard wore a necktie for his interview with the Federation News Network in 2399. (PIC: "Remembrance")
Almost 800 years later Federation agent Kovich wore a necktie while interviewing Philippa Georgiou at Federation Headquarters. (DIS: "Die Trying")