floppy hat

It's also called wide-brim hat, a style of hat make from straw or other woven materials, large and soft brim, protect face and shoulder from the sun. They popular for outdoor activities in the sun, beachwear, gardening, etc,...
This tag often go with swimsuit, bikini.

Please do not confused between straw hat and floppy hat, the material to make floppy hat can be straw, wool or felt, color can be white, black, blue, etc,... any color. The brim of floppy hat always wide and soft, usually worn by women.
Meanwhile straw hat's brim can be stiff and narrow, only made from straw (natural and synthetic) or dry stalks of cereal plants , and the color usually pale-yellow, can be worn by men or women.