the GNU version of the Collaborative International Dictionary of English
n. The business of making hats; also, stuff for hats.
The Century Dictionary and Cyclopedia
n. The trade of a hatter.
n. Material for hats.
n. Working by one's self and without associates or helpers, specifically as practised in gold-mining in Australia; one who has everything ‘under his own hat.’ See hatter, 2.
Word Usage
"A double dose of 'hatting' would be an altogether different matter."