Silk
One of the most valuable, luxurious fabrics, cultivated from the cocoon of the mulberry silkworm, which spins one long continuous thread. The process is slow and delicate, which is why it costs what it does. Lightweight so it never overheats, naturally elastic so it keeps its shape, temperature regulating so it cools in heat and warms in cold. Smooth to the touch, quietly shiny to the eye.