I was responding to a thread about "vegan" coats.
I found it odd that polyester and conventional cotton clothing were considered to be "vegan."
It is well established that polyester, being derived from petroleum, is therefore very harmful to the environment, disruptive of ecosystems, and therefore, poses a danger to animals. (As you are probably aware, drilling for oil is very hit and miss, meaning that many sites must be drilled. Even if successful, oil spills, as well as the destruction of the areas where oil is not found, as well as the large amount of energy required to drill, are all factors).
Conventional cotton requires the heavy use of pesticides, which kills or at least poisons plants, animals, and human beings via the soil, the water and as airborne poison.
Therefore, if vegans want to protect animals from unnecessary and preventable pain and death, both polyester as well as conventional cotton clothing should not be considered vegan.
Therefore, if you already have clothing made from conventional cotton or polyester, use it for as long as you practically can. That means repairing clothing rather than replacing it.
If you must replace clothing, then buy organic cotton clothing, or clothing made from recycled materials.
Please, don't be fooled into believing that polyester and conventional cotton are "safe" or protect animals. Both cause unnecessary death and suffering to animals.
Yes, organic clothing does cost more, but with proper construction and care, they should last a good long while. And remember, the more truly vegan clothing you buy, the lower the price will be as these companies are able to grow.