In “The Eleventh Hour,” Matt Smith’s Doctor declares “bow ties are cool.”

Apparently, fans agree.

Sales of bow ties are up in the U.K. reports London’s Telegraph.

Topman, a store that targets the same young demographic as “Doctor Who,” reports sales of bow ties are up 12 percent in the last month.

A spokeman for the store said: “Since the new Doctor Who aired we have seen a dramatic rise in bow tie sales, in the last month up sales have increased by 94%.

“Last week alone they accounted for 14% of all our tie sales – whereas over the last 6 months they have been only taking around 3% of our tie sales.

“It appears that the Doctor’s fondness for bow ties has been picked up by some of our shoppers and has translated into extra sales.”

The bow tie is thought to have first come from Croatian mercenaries in the 17th century during the Prussian wars, when they used it to hold together the opening of their shirts.

It was then adopted by the French who developed it into the form it is seen today and is worn by the Doctor.

They are usually associated with professors, teachers, clowns – and of course – doctors.

Guild of Tiemakers chairman John Miln said he was pleased the unusual trend had been kicked off by the show.

He said: “Doctor Who has sparked a trend and a renewed interest – there’s no doubt of that.

“It’s always pleasing to know when TV stars start wearing something a bit different.

“There’s obviously going to be significant interest in these style of ties now that he’s wearing them.

“I think that everyone that is on television has a big influence on the public and I would expect that the Doctor is right up there with the best of them.

“In my mind they’re going to be worn on nights out and special occasions.

“I think most of us have got bow ties hidden away somewhere and I think we are going to be seeing more of them out on the streets.”