Meanings of white boa in English

She was wearing an ankle-length satin dressing-gown in electric blue, with a white boa collar.

It was true she had a new set, warm and serviceable, but-well, a short-haired ,dark-browncollarette hasn't the allure of a fluffy, snow-whiteboa.

"Is there a young lady staying in this neighborhood- averyattractive girl-witha little white boa round her neck, and white fur round her gloves?"