For Navi, the left cat, we call her Chunka Munk, Plasticat, and Ms. Infected Lips.
For Scorpi, the cat on the right, we call him Mr. Small, Spider Cat, and Crybaby.
At the time we were using suede pillowcases, I believe. We have since switched to silk.
That being said it’s all but impossible to avoid microplastics in attire. 100% cotton clothes are rare to come by, are expensive, and hard to wash and dry. Wool is all of the above with the addition of being itchy. All couches have carcinogenic fire retardants; all chicken is bathed in chlorine.