What not to wear/wash? Say NO to fleece.

I think it is unlikely that all fleece wearers will discard their jackets etc but I would suggest that those who love them for gardening, dog walking and so on could simply air the on the washing line rather than washing them.

Air on the washing line?

They'd stand up on their own if not washed.

Haha at the vision Merlot but pegging out in a stiff breeze freshens lots of things that don't have stains or muddy bits

Cotton fibres aren't a problem. They are plant material and will compost down easily. You can even compost old cotton clothes at home if your composting technique is good enough. Ditto linen and even, I think, viscose, which is made of cellulose.

Animal fibres also rot down naturally.

Hanging woollens outside on a damp day is a good way to freshen them up. Wool does not hold onto dirt in the way synthetic fibres do.

You can put hair trimmings and nail clippings on your compost heap as well.

And cardboard.

Someone will perhaps mention sheep shit sticking to their backsides. It is the lanolin that it is sticking to, not the wool. By the time woolen fabrics get to us the lanolin has been washed out.

Doesn't it depend what type of sewage you have and what type of filtering?

For example our waste water passes through 3 chambers of sand - would the fibres make it through?

Oh, for God's sake! What a trivial thing to wirry about!

Worry, even.