In reply to Flinticus:
I understand that some fabrics are needed for specialist uses (like high wicking running t shirt) might need to be synthetic, or for that matter the huge benefit of elastic blends (who has worn sock suspenders, or those elastic things for socks with the tag/tassel in scout uniforms, lycra killed them off in the '60s) but as a general principle... would/should there be equal or more discussion about owning a lesser quantity of better clothes (including more natural materials) rather than the disposable "Primark" society we have today.
No idea if the statistic that in UK most items of clothing are worn on average 7-10 times is true, but the worrying thing is that it could be. To be that cheap and disposable there needs to be questionable ethics in the manufacturing and cheap synthetic or synthetic mix fabric
Filters sound impractical and probably a liability, if they're fine enough to filter *micro* plastics they'll rapidly get clogged by everything from limescale flakes to any old fluff to that tissue my wife left up a sleeve before putting it in the machine on a dark coloured load 😡
Unfortunately, I think I'd have to take a pair of kitchen scissors or snips to remove the filter, while keeping the filter rubber edge probably needed to act as a gasket, if one was in a washing machine of mine.