BBc/ Robert Viglasky

The Sherlock Victorian Christmas Special Trailer Is So Good You'll Wet Your Victorian Pants

He's wearing the hat. HE'S WEARING THE HAT.

Not that there's anything wrong with falling leaves and pumpkin spice lattes, but right about now, "Sherlock" fans have to be wishing it was Christmas already.

A new trailer for the BBC series' Christmas special, which finds Holmes and Watson transported back in time to turn-of-the-century London, has dropped, and it's everything an old-school Sherlock Holmes story should be.

We've got cobblestone streets and oily gaslights; frightened ladies in high-necked dresses; Watson with a pistol and a phenomenal mustache; an ominous period-appropriate soundtrack; and of course, Benedict Cumberbatch as Holmes.

The Christmas special promises to be a creepier take on the BBC's "Sherlock," and the first peek is heavy on Victorian chill -- which is good, because we've officially lost ours.

Fans will get their long-awaited return to 221B Baker Street in December. In the meantime, you can watch the full trailer below.