Ermine are commonly used for drops on bonnets and other headgear. They are also frequently used on Blackfeet shirts. The tails are often prized for use in chokers. Ermine are actually weasels. In the winter, their coat is white. In the summer, they turn brown. During transition, their backs start turning grey and they are referred to as "greybacks." Ermine are getting harder and harder to find and the quality is diminishing.