you make a good point about how clothing doesn’t just exist for the life of the first wearing. Impact also looks largely at how it’s discarded and washed and that is a huge factor.
Cotton isnt leaving behind microplastics in your water like polyester. So even the shower claim is non comparable. At least the water is left cleaner with with cotton.
But then we can’t be too ideal like they aren’t taking up space on the planet to produce. Like how people were about ecars Vs combustible.