The Peter Pan collar is a style of collar that originated in the 1900s and was popularized in the 1950s and 1960s. This type of collar is iconic and is well-known for its rounded, flat shape that sits around the neckline. While the name "Peter Pan collar" is more commonly used, there are several other synonyms that people can use when referencing this style. For example, this type of collar is also known as a flat collar, a round collar, a Peter Pan neckline, or a chemisette collar. Regardless of what it is called, the Peter Pan collar remains a classic and timeless component of fashion.