. . . to give hair.
For archives, an envelope filled with hair is not a new thing. It’s part of the job.
This hair is a bit different than what we normally see. It seems to be an early example of clip-in extensions. Note the gathered section that could be pinned close to the scalp.
Allie May Autry Kelley‘s labeling on the envelope is pretty great, too: “Who’s hair? Mom’s?”