Maybe I'm not the only one who didn't know etymology of
milliner:
milliner

SYLLABICATION: mil·li·ner
PRONUNCIATION: ml-nr
NOUN: One that makes, trims, designs, or sells hats.
ETYMOLOGY: Probably alteration of Middle English Milener, native of Milan, from Milan, the source of goods such as bonnets and lace.

I didn't think that there could be a mill to grind out hats.