The ascot tie is descended from an earlier type of cravat widespread in the early 19th century. It was made of heavily starched linen and elaborately tied around the neck. Later in the 1880s, the upper-middle-class men in Europe men began to wear a more loosely tied version for formal daytime events. The ascot was still commonly worn for business with morning dress in the late 19th and very early 20th centuries. In British English, the casual form is called a cravat, or sometimes as a day cravat to distinguish it from the highly formal dress cravat. It is made from a thinner woven silk that is more comfortable when worn against the skin, often with ornate and colorful printed patterns. Here is a video showing how to tie an ascot tie.
I hope you found the video informative. If you are interested, Here are some ascot ties for you to take a look at.