I alway bring some really big heavy duty garbage bags from the school, and make ponchos for the unlucky winners of the garbage bag fashion show. Kinda like wearing a dunce hat, but it saves your life.
Likewise I always bring a giant trashbag. Really giant, they are the things used in big wheels trash collection hoppers, 6 feet tall x 4 feet wide.
And I replace them at least once a year, either after use as a head and arm hole cut poncho for someone wet and without raingear, or after use as a spare groundcloth inside someone’s wet tent. Cut open that is a huge piece of plastic. That bag stays at the bottom of my essentials kit/bail out bag and makes a nice give-away for someone with wet issues. Worst case scenario I could use it as a small tarp or bivy bag.
As far as raingear goes
Gore Tex jacket and pants plus a wide brim OR hat.
Ditto, with whatever footwear is appropriate. GoreTex does work OK for me, at least in cooler temps and my preferred non-strenuous modes. I have considered inexpensive Frog Toggs or the like, but even with medium quality/cost raingear I wear out a set every 4 or 5 years. I don’t think Frog Toggs would last me a year, maybe not a trip.
Admittedly I do wear “raingear” 6 months of the year, even when it is not raining. I like the having that third layer available to don over some combination of long underwear, fleece and maybe even a down vest, both for warmth and as a wind barrier.
The one wet-flaw in raingear is the need for waterproof shoes or boots for use in camp. Rain running down the pant legs or walking through wet brush (even dewy grass) will soak a pair of camp shoes. I really like the combination of paddling boots for use in the boat and Gore-Tex lined trail runners for use around camp. The trail runners are lightweight and give me a chance to air out my paddling shoes or boots.