Something to doff is a HAT, which is a three letter word. A HAT is a type of headwear that is typically made of fabric or straw and is used to protect the head from the elements. It is also often used as a fashion accessory. Hats come in a variety of styles, such as baseball caps, fedoras, beanies, and sun hats. Doffing a HAT is a gesture of respect or politeness, and is usually done by taking the HAT off and holding it in front of oneself.