Did the whole Bib last year and used all of those categories of gear!
1) Marmot Precip Jacket (380g) - have one I use on the occasional day hike, wets out quickly, and is heavy, but cheap. You will need a good rain jacket, but most of the walking does not involve pushing through scrub so it doesn't have to be tough.
2) Rab Vital Windshell (125g) - I run hot, so my favourite piece of gear is a lightweight wind shell, with a base layer and active good to about 6C with a 100 weight fleece to to zero. If it's hot (above 15C) I'll often just hike in a base layer and windshell and get wet. I just have a few cheap Chinese versions, usually I take the one with the most breathability and it packs up to nothing
3) Helinox Umbrella One (220g) -
https://www.helinox.com.au/umbrellas Used one lots on the Bib, where much of the first 700km (from Perth) is in forest, so it worked well, useless along the coastal section, not convinced I would take one if I walked the Bib again. I did make up some shock cord straps to hold it to my shoulder straps so I could still use two poles
4) Silnylon Rain Skirt/Kilt (65g) -
https://www.aliexpress.com/item/3285194 ... 4c4dMap77O Yep used one, (just upgraded to the newer version) basically worked great, just turn the split to the leeward side when the wind is strong. Could have lived without rain bottoms, but given the weight and how small it packs down, it adds a layer of luxury