Polyester fabric is not biodegradable. To understand why, it helps to know how it's made and why it sticks around so long.
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What is Polyester? How Is It Made? And Why Is It The Bad Guy
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On Its Journey To Make Clothing That Leaves No Trace, The North
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Recycled Polyester vs Cotton: Which Is More Eco-Friendly?
Polyester vs Recycled Polyester: Is the Latter Eco-Friendly
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Is Polyester Eco-Friendly? Why You Should AVOID The Fabric - My
PDF) Biodegradability Study on Cotton and Polyester Fabrics