Hat: Head covering of any of various styles, used for warmth, fashion, or religious or ceremonial purposes, when it often symbolizes the office or rank of the wearer.

帽：各种样式的头部覆盖物，用以保暖、追求时髦，或是为了宗教、仪式的目的，通常用来象征戴帽者的官职或阶级。

youdao

The C stands for cover. Wear a hat and scarf to keep heat from escaping through the head, neck and ears.

VOA: special.2009.12.23

So it's true that Ale knows that at least one person in the room has a pink hat on their head.

所以艾尔确实知道,至少有一个人戴着粉色的帽子

耶鲁公开课 - 博弈论课程节选

Well I'll reveal the facts now: that in fact Ale knows that Kaj has a pink hat on his head.

我已经告诉你们了,艾尔只知道卡佳戴着粉色帽子

耶鲁公开课 - 博弈论课程节选

But its fortifying magic works wonders to combat moisture-free air and hat head.

WSJ: Maintaining the Gloss | Outer Beauty

The wind lifts the straw hat from his head and tosses it playfully into the flames.

NPR: Excerpt: 'Woodsburner'

We packed it all up and I got behind the wheel and put a chauffeur's hat on my head.

WSJ: Ricky Lauren on Driving in the Hamptons | Traveler's Tale