Just another fad for hipsters? It’s much, much more:
The idea is that all the mindless manual labor which our ancestors spent all of history trying to escape is actually beneficial for you, whereas letting modern machinery do your drudgework, like, cheapens your basic essential humanity somehow. So forget modern, impersonal, factory-made mass-produced clothing; you’re not really “dressed” unless you’re wearing clothes you made yourself, using your own spinning wheel to spin your own thread out of fibers from your own pet sheep or gardenful of flax or cotton plants, then weaving those threads into cloth with your own loom.
This is, after all, The Way It Should Be:
Do what our ancestors did: be independent and self-sufficient, live a healthy, natural back-to-the-Earth lifestyle, spend years of repetitive labor producing a single piece of fabric, then drop dead by 35.
Think of your carbon footprint, man!