I don't know why garments are distributed to the landfill. I wear items numerous years and after that clean them and possibly consider them to some consignment store, or to Goodwill. I have a few items that I continue to hang on to. I dress in them every so often as that design will come back again in vogue.
With issues like denims, I dress in them when they are new out and about, then right after they become old, they are my gardening clothes. Sooner or later they completely use out and that i can cut them up and place them while in the compost pile. Outdated best fabric for wedding dress get related treatment. Initial out and about, then for gardening, then I reduce them into pieces. I am able to utilize them as rags in my home. The odd shaped bits can just visit the compost pile. I cut them modest and just mix them in.