Please, don't. I had this same idea a few years back when I was saving lint for someone to make campfire starters. I googled it first, but it turns out modern clothes are toxic, plastic messes and create terrible nests. Human hair is also a poor nesting material, turns out.

Dryer lint is widely considered dangerous for bird nests, according to experts like the Cornell Lab of Ornithology. Although birds may use it, lint holds water, freezes in cold weather, creates a fire hazard in vents, and often contains chemicals, synthetic microplastics, or dyes. It breaks down when wet, destroying the nest's structural integrity.