Alpaca Beanies

The cloth covered button on the crown is about the size of a bean seed and may be the origin of the term "beanie".   Some academics believe that the term is instead derived from a type of headgear worn in some medieval universities.

The urban dictionary, the source of many a defination to broaden your vocabulary defines said garment as .... "a beanie is usually woollen and it is worn by skaters and people who are cold"

Fredercik:  I’m Freezing!!
Angelina:  Of course you are, you forgot your beanie!