I co-authored an evidence-based call to action for promoting simple DIY masks some time ago [1] and it got some good resonance from politicians.

Still, we don't see adoption of DIY masks in most countries so far, and I start to wonder what is holding back officials from promoting it. Maybe the variability in quality of DIY masks made by individuals might be too large, and officials just have too strong of a resilience against such DIY solutions as to ever promote them? Perhaps a standardized design for cotton masks, not made by individuals but local businesses would be more acceptable for officials?

[1] https://link.medium.com/LY7RRNr2X4 "Promoting simple do-it-yourself masks: an urgent intervention for COVID-19 mitigation", Svara et al. 2020