I mean, this goes beyond sewing and microfiber to all synthetics containing plastic: that includes materials like polyester, nylon, acrylic etc. I would personally recommend avoiding ALL plastics as much as you can, when it involves your food (so no plastic containers, food processor jars etc) and of course, avoid clothes made from these materials completely.
At the very least, you should avoid tops and bedding/blankets/pillows made from synthetics, to reduce the amount of microplastics you're breathing in to your lungs. Microplastics/nanoplastics are pretty much everywhere now and they're known to cross your blood-brain barrier, cause inflammation and can even cause cancer. We're in too deep to avoid it completely now, but we can certainly try and reduce our exposure to it.
Also see: https://www.meghantelpner.com/blog/your-clothes-are-made-of-plastic/