I have been selling my extremely high quality plastic clothing (Veillance made in Canada items and Canada Goose) and been replacing them with wool and cotton.

Ventille cotton can keep you dry without plastic. Developed in WW2 by the UK for hoses and buckets when rubber was in short supply. Wanted cotton is another option but doesn’t breathe.

Mover - a Swiss brand - have an entire range of plastic free clothes of high quality.

Tons of other options but the above are easy substitutes at the high end.

Bonus, unlike even the best plastics these age beautifully and there are no taped seams to degrade.