Is there such a thing? They need to be padded on the bottom.
Currently I wear these (the long trouser version)
https://www.ebay.co.uk/itm/203791153182 but on a warm summer day they are too warm. These are cheap and dirty chinese trousers (I used to get them for about £20; they are a bit more now) and the zips disintegrate after a few months, but they are the best I have found so far. In the winter I wear pricey waterproof trousers (about £90) over them and that works well.
The stinging nettles are all over the tracks now. I even have to wear thicker gloves