Recycled polyester, often called rPET, is made from recycled plastic bottles. It is a useful way to divert plastic from our landfills. rPet requires a lot less resources than producing new fibers and emits less CO2 emission.
There are 2 ways to recycle polyester: Mechanical recycling consists in melting the plastic to make new yarn. This process can only be done a few times, then the fiber loses its efficiency. Chemical recycling involves breaking the plastic molecules and reforming them into yarn. With this process the quality of the fiber is similar to a virgin one and it can be recycled infinitely. However this process is rare and expensive.
Recycled polyester is definitely a sustainable option for our wardrobe. However we need to precise that is still non-biodegradable and takes years to disappear once thrown away.