An excerpt from a blog post about sustainable fibres:
On par with hemp, linen remains traditionally and historically one of the best and most sustainable fabrics to date.
Made from the flax plant, linen production uses the plant in its entirety, lessening waste from the get go. Flax is easily grown and quickly replenishable, using far less water than cotton, and no chemical fertilizers or pesticides, making linen production very sustainable (this when dew-retting or enzyme-retting is used, not water-retting).
Linen as a fabric has a very long lifetime, as it’s one of the most durable fabrics out there. With a recent resurrection, linen clothing is coming back as people seek ways to lessen their fashion footprint. Linen is breathable, durable, lightweight, absorbent, antimicrobial, naturally moth-resistant, and cooling, making it perfect for summer days. It also reduces gamma radiation almost by half, protecting us from solar radiation. It’s the only fabric that is stronger when wet, and like hemp, becomes softer with use. Also, like hemp, micro-fibres from linen are of no concern, as they will naturally biodegrade in the water.
Linen pieces that are left undyed or naturally dyed will biodegrade 100% with time, making it sustainable and earth-friendly.