The two crossword solutions for the term 'Summer Headgear' are 'BOATER' (6 letters) and 'Sunbonnet' (9 letters). A BOATER is a type of hat made of straw, usually with a flat top and brim. It was popular in the late 19th century and is still worn today as a summer accessory. A sunbonnet is a type of head covering, typically made of cloth, that is designed to protect the wearer's face from the sun. It is often seen in rural areas and is also a popular choice for summer headgear.