The fabrics I use are well chosen from reliable companies that I trust. Some I even became friends with over many years of working together.
I love natural fabrics and dislike the feeling of polyester on my skin. So I make sure that the fabrics I use are 100% natural.
Just a tiny summary of a big topic, it is hopefully easy to understand why natural fabrics can never be as cheap as synthetic fibres. Whatever natural fibres you think of: You need land to plant, seeds that spear, farmers that work, water to grow, spinners that make the yarn, weavers that make the fabrics and dyers that color them. Compared to polyester and such, - which is just a mix of synthetics - it's a lot more work and investments for each step.
Read why I use the fabrics I chose and the good features they bring along.