Although Wikipedia says the term Ermine is used more when talking about an all-white stoat.
Usually you see the white fur-lined cloaks referred to as Ermine. And in heraldry: https://en.wikipedia.org/wiki/Ermine_(heraldry)
With the fur, for some reason it was fashionable to keep a black-tipped tail, so you see in contemporary paintings and in heraldic devices the periodic black spots in a field of white.
Although Wikipedia says the term Ermine is used more when talking about an all-white stoat.
Usually you see the white fur-lined cloaks referred to as Ermine. And in heraldry: https://en.wikipedia.org/wiki/Ermine_(heraldry)
With the fur, for some reason it was fashionable to keep a black-tipped tail, so you see in contemporary paintings and in heraldic devices the periodic black spots in a field of white.