These are 1880s bustles. As you can see, they have a similar pattern. There are the dull hoop-type bustles, the mummy-bustles, and the narrow bustles just in the back in casings. The interesting part is that there are also some stranger and more fascinating short bustles. I know it is a lot of pictures to scroll through, but make sure you get that far because they are cool.
Plain hoops.Mummy-style bustle
Casings, all the bustle in the back.
Short bustles! I adore them.