Very nice. I have a similar project languishing on my poor, ignored workbench. You may have inspired me to change that. Good typing to you!

Unfortunately the environmental impact depends on the processing used. The cheapest and easiest version is unfortunately chemically intensive and basically the same way they make rayon. There are other options, but then the price goes up. So extra due diligence is required if you are concerned about the impact of your bamboo clothes.