These three metal buttons each have some fabric incorporated in their design. I have quite a few similar type buttons and I bought them as part of a small private button collection several years ago. I have them in a box and when you open the lid you can smell the perfume even though they are so old. The story goes that the ladies used to put a few drops of perfume on the material to give off a nice scent to distract from other odours. Velvet was a very commonly used fabric.