It’s funny seeing so many people promote “use them as rags!”!
Sure that’s possible but it’s not an absolute.
We can use old electronics as a paper weight (“and more!”) if we want to but people don’t normally promote that.
Presumably natural fibers (wool, cotton, hemp etc) can be composted (conveniently ignoring buttons etc) and everything synthetic can just be landfilled (what else can we do with plasitcs).
Im a bit of a cynic but it’s acceptable to “dispose of” items. Hopefully we can keep in mind reduce, reuse, and recycle but there’s a functional limit to those things.
It seems likely any “trash handling technology” to arise to settle this has bigger fish to fry than just clothing - if any “plastic eating microbe” was employed commercially it makes more sense to me to stick it on the landfills rather than an old laundry basket