Looks exciting! Glad to see more multi-day longer distance stuff popping up around the country. Haven’t personally done this hike, but spent a fair amount of time hiking on the west coast. Will throw my two cents in but sure there is someone much more knowledgeable on here.
Carry as little as possible, the mantra is that people pack their fears. But it slack packed, in a group with daily camp sites, not too much to go wrong there. Which seems like a great opportunity to walk light and enjoy it. Always amazing how many little things you can fill a bag with ‘just in case!’. If it is a new thing for you, definitely go on a nice long day hike and see what you actually use and leave the rest.
Shoes - The west coast is not tough terrain largely and you aren’t carrying a heavy pack. I would go a comfy pair of breathable trail runner. Boots would be overkill in my mind. The fight on any long walk is protecting your feet. Breathable trail runners (Don’t go too big on the mesh here, the WC is a lot of fine dust), comfy socks (Fond of Belega and Injinji, toe socks are irritating but great for certain feet!) and a short gaiter to keep things out of your shoes will do you well (Very happy with my AR Mini Gaiters, always feel silly but they make a world of difference).
Feet - System that works for me is two pairs of socks, switch them at lunch and rinse dirty pair to dry on my pack. Carry some shortish Leukotape P sections on wax paper for blisters, stuff is brilliant and a roll has lasted me years. Deal with any hotspots early as possible! And then breath and pamper your feet at night If you are the type to be interested by this sort of thing Fixing Your Feet is an amazing resource and book on this.
Cold/Wet - West coast can get cold at night, a good warm jacket will be great. You arent carrying it so go for anything you have! In terms of the day, I’ve never been in any sustained rain on the WC really. Misty and drizzly is about it, would pack an emergency poncho or something light for the rain and a fleece and wind jacket layer for the day. If you are moving it is as much about blocking the wind and being able to dump heat as actual warmth. A fleece beanie and gloves are always great for early mornings! All things fleece go cheap and light. I swear by Decathlon for this stuff, cheap and as solid as anything else unless you really ramp up the budget.
Sun - Up to you, some people are all shorts and tanktop folk. The WC is hot and can be deceptive to me, you can get a nice cool breeze and not realise you are cooking. Would rather have to use less sunscreen so my go to is physical barriers these days, long sleeve button ups with a high collar and pants. Light polyester is great for this, but can get smelly. Avoid cotton, hot and unpleasant unless the humidity is really up there. Been pretty happy with Columbias Silverridge Lite stuff these days, weird sizing and pricey but often on special at sportmans warehouse. Pants are all awful in my experience Wearing some light nylon ones from Decathalon and they are fine, NH100 I think. If you can do shorts, anything light polyester in the 7inch by the major sports brands will do (Nike drifit works for me). Pockets are handy.
Hats, if you can go full brim awesome (Avoid cotton! Made that mistake before, a nice farm hat is lovely until it is soaked in sweat). They irritate me in the wind, so tend to go peak running hat with a buff I can tuck under it to cover neck and ears if need be.
If you struggle with the sun I would give a travel umbrella some serious thought. The WC is not exactly covered in shade. Umbrellas are amazing on a long exposed walk. Bungie it to your shoulder strap for hands free. Irritating when windy though.
Trekking poles are your friend! Particularly if you are not that fit or have any knee issues. SA seems to avoid them, but maybe to do with we don’t have a lot of long trails. Just youtube how to actually use them.
Excuse my long ramblings about gear! Can’t get out that much these days so it is a nice distraction
Look after your feet and have a blast! PS. On that note, with WC hiking, keep your shoes on while hiking on the beach. At the end of the day combining a pack and wet, raw abraded feet is not a fun time even though it seems amazing in the moment haha.