How To Tie An Ascot or Cravat (an ascot is tied under the collar, a cravat is tied over the collar)
Cravat ties. Please note, most examples I have found where people attempt to ties these today come out way messier than what any regency gentleman would have accepted.
The best instructions I've seen for how to tie a cravat, three different ways.
HOW TO TIE A Cravat - Neckwear Gentlemen's Wedding Neckwear
How To Tie A Cravat: Tying a Cravat, Instructions for Cravats
How to tie a Formal Cravat - Yep, Yep and Yep!
How to tie a cravat.
How to Make a Victorian Cravat or Ascot Tie (UPDATED AND IMPROVED) Tutorial by Steam Ingenious
How to Tie a Cravat- because seriously.
How to tie a cravat...Just in case we ever need to know this suddenly ;)