I do wonder what it means when the statement "no adhoc masks i.e. scraves and bandannas" is spoken, but there are manufacturers that are producing scarf-like gaiters that have replaceable filters in them, so are (theoretically) as good as a cheap cloth mask with filter but ultimately more convenient and comfortable.
I have one of these and am concerned that I'll get challenged when wearing it, as it looks "ad hoc"...

https://www.buff.com/nz/buff-filter-tube-graphite-htr.html



