Reddit mentions of Pirate Medieval Renaissance Linen Large Sash [Almond]

Well, loose fitting pants works this character, so i'd recommend thai fisherman pants. Loose to kind of convey that messy practice. Affordable so you can get different pairs in varying color schemes as well.

A long hooded blouse might be good, like this one. Sort of form fitting to make it easier to grab things on the ground without getting caught on brambles too much, but stylish enough, also available in several color schemes.

A good sash to help keep it together would be good, with a leather belt and pouches or a good small satchel on top of that.

Sorry if it isn't to your liking, I was just kind of spitballing ideas and themes that were more affordable. If money is not an issue you can certainly go pricier.