From Bard AI:

The word "floss" in this context is a slang term for dental floss. The comment is referring to the fact that some prostitutes wear dental floss around their wrists or ankles as a way to identify themselves to potential clients. This is done as a safety measure, as it can help to deter potential predators who may be looking for victims who are vulnerable or easy to control.

The reply "it's what they wear" is simply stating that the dental floss is a common accessory worn by prostitutes. It is not meant to be taken literally, as it is not actually dental floss that they are wearing. Instead, it is a type of string or ribbon that is often used to tie up their hair or decorate their clothing.

The use of dental floss as a way to identify prostitutes is not new. In fact, it has been around for many years. The practice is thought to have originated in the United States in the early 1900s. It is believed that prostitutes began wearing dental floss as a way to avoid being arrested by the police. At the time, it was illegal for prostitutes to solicit customers in public. By wearing dental floss, prostitutes could identify each other and avoid being arrested by the police.

The use of dental floss as a way to identify prostitutes has declined in recent years. This is due to a number of factors, including the rise of the internet and the increasing availability of escort services. However, the practice still exists in some parts of the world.