The cravat, a neckband, is the predecessor to both the bow tie and the neckband we know the best today, the necktie. The cravat derives from a type of neckwear style that was worn by the members of the Croats, a 17th-century military unit based in the Habsburg Monarchy, which is now broken into Austria, Hungary, and the Czech Republic.
To make things perfectly clear, the cravat is NOT EVER to be confused with the Jabot, a similar piece of neck-wear that was worn by men in the 17th and 18th centuries. Some cravats look like Jabots, but they certainly are not jabots.
In the 19th century, there were five well-known types of ties, especially in the Victorian Age, including Ascots, Four-In-Hands, Bow-Ties, Western Ties, and of course, the Cravat, which eventually preceded the necktie, which of course, we know the best to date.
Cravats of the Victorian Era are tough to find most of the time, and the most modern cravats we see in movies, TV, or stage plays turn out to be the kinds of cravats that are tucked underneath the dress shirt, made to look sort of like an ascot. That type of cravat can be fount on Amazon. An example of some on Amazon can be found by clicking here. You might as well try searching for one in the Victorian Style like in the first two photos above in eBay, Etsy, or The Historical Emporium.
https://www.etsy.com/sg-en/listing/690189098/white-flower-day-cravat-victorian-ascot
Unfortunately, the ones like the Victorians turn out to be tough to find, and as I said, you would have to look through various shopping websites such as Etsy or The Historical Emporium, and other websites such as them.
If trying to find these for Victorian Era set movies, TV shows or stage plays, please do keep these tips in mind on where to find them online.