Garden mesh ideas

I personally try to avoid polyester and any other synthetic materials in general but today I convinced myself it was okay. I bought some meshbags/material from thriftstores and dollarstore intended for use in the garden to protect from pests, prevent cross pollination etc. But immediately after I felt a wave of guilt. I was trying to keep it cheap but now I regret not spending the extra money and investing in a healthier option, both for myself and the environment. Has anyone attempted to use muslin or will that shade out the sun too much? I am now debating going to a fabric store to find fine mesh 100% cotton but I dont expect it to be cheap for how much I need. Any ideas?