It is called a corno ducale and was a type of ducal hat, worn over a linen cap.

Very fashionable married women abandoned the linen cap and wore their hair uncovered or with a hat.

Married women covered their hair with a linen cap, over which they might wear a tall black hat.

Her hair was a mess, but they had a plain linen cap to cover it up.

She bent and tied the dangling strings of Agnes's linen cap.

It stuck out under her linen cap at all angles, and she had obviously slept by the hearth.

He wore the pointed linen cap worn by many of the Pharisees, so I couldn't tell if he'd lost any of his hair.

They were dressed in borrowed finery, linen caps and cloaks.

'Yes,' says my neighbour, who sports a white linen cap.

She wears a tall black hat called a capotain over a sheer linen cap and simple jewelry.