What is a "boater"?

A boater is a type of formal summer hat typically made of straw or sometimes, less commonly, of synthetic materials. It features a flat-topped crown and a flat brim, often with a ribbon band around the crown. It became popular in the late 19th and early 20th centuries as a fashionable accessory for men and women alike, particularly for sporting events and outdoor activities. Today, the boater is still worn as a classic fashion statement for both men and women, often paired with formal wear such as blazers and suits.