Tie

A tie was an article of clothing commonly associated with men's apparel on the planet Earth. Ties were worn for their style value, but could also signal levels of formality, association with particular schools, companies, or other groups. A tie was also favoured by the Doctor in most of his incarnations.

The First Doctor
The First Doctor almost always wore a wing collar with a bow tie, which took the form of a long, oblong piece of cloth tied in a large bow. It was almost always dark in colour, but on one occasion he wore a tie that had a black-and-white checked pattern. (DW: The Rescue)

On Vortis, the Doctor used a Coal Hill School tie belonging to Ian Chesterton to test an unknown liquid, finding it to be acid. Ian was momentarily more concerned about the loss of his tie than the fact that his life had just been saved. (DW: The Web Planet)

The Second Doctor
The Second Doctor typically wore a small, pre-tied bow tie. He attached it to his shirt with a safety pin, and it also performed the function of closing the top of his shirt, in place of a collar button.

The Third Doctor
The Third Doctor occasionally wore ties, favouring large, velvet butterfly-style bow ties to go with his distinctive velvet smoking jackets.

The Fourth Doctor
The Fourth Doctor sometimes wore a four-in-hand tie, but also often went tieless or wore a loose cravat or scarf.

The Sixth Doctor
The Sixth Doctor wore long bow ties in a loose knot in the style of the First Doctor, but his became wider at the ends with diagonal edges. Additionally, rather than being plain they were either bright blue or red with polka dots, or yellow with a starfield pattern.

The Seventh Doctor
The Seventh Doctor usually wore a four-in-hand tie in a paisley pattern.

The Doctor deflected some oncoming criticism by saying, "Let me guess. My theories appall you, my heresies outrage you, I never answer letters, and you don't like my tie!" (DW: Ghost Light)

The Eighth Doctor
The Eighth Doctor typically adopted a silky cravat, originating with the Wild Bill Hickok costume that he appropriated shortly after regeneration.

When the Doctor was denied access to an area of the R101, he protested, "I'm wearing a tie!" (BFA: Storm Warning)

The Ninth Doctor
The Ninth Doctor went tieless because he wore a leather jacket and a jumper.

The Tenth Doctor
The Tenth Doctor usually wore four-in-hand ties of various patterns with his suits, but he also went open-collared sometimes. On formal occasions, like the presentation by Lazarus Laboratories or the party on the Titanic, he wore a bow tie. (DW: The Lazarus Experiment, Voyage of the Damned)

Before they had met from her perspective, the Doctor got Martha Jones' attention in the street and dramatically took off his tie. He did this after they had met and experienced the story's events in his timeline, but before this in hers, as a "cheap trick" to prove he was telling the truth. (DW: Smith and Jones)

The Eleventh Doctor
The Eleventh Doctor wore pre-tied red and blue bow ties, and wore a white one to Rory and Amy's wedding. (DW: The Big Bang) He frequently remarked on how he considered them to be "cool", contrary to Amy's belief they were not. (DW: The Eleventh Hour, Amy's Choice, Vincent and the Doctor, The Lodger, The Big Bang) He also complimented Dr. Black, twice, on his choice of tie. (DW: Vincent and the Doctor)

Other Usage

 * Ian Chesterton often wore a four-in-hand tie while travelling with the Doctor.
 * Vislor Turlough continued to wear his Brendon Public School uniform, complete with school tie and wing collar, through most of his travels with the Doctor.
 * The Silence wore ties along with their suits. (DW: The Impossible Astronaut)