He's in the wool business.

他做羊毛买卖。

《新英汉大辞典》

Funny, I thought those colors were dyed in the wool, better check the label...

有趣。 我以为那些本色是不会变色的（根深蒂固，dyedin the wool），最好看看那些标签……

youdao

youdao

The wool must be clean. Leave it overnight in water and liquid soap.

VOA: special.2010.08.02

They sleep together and Silva takes the monkey to the center each day on her bicycle, the baby snug in the wool bag.

NPR: Monkey-Mothering 24-Hour Chore For Colombian Woman

Besides my wife and me we had two friends over, including a dyed in the wool Peter Luger enthusiast from pre-hipster Brooklyn, and we all tasted my own grass fed T-bone first.

FORBES: Steaks Worth Bragging About Are Dry Aged

And it may not be wise to follow the example of the man in the wool Union Jack cap who crashed Simpson's victory interview on NBC and cooed what sounded like a lonely seagull call.

WSJ: Webb Simpson Conquers Olympic Beast: Jason Gay