Happy to help but give yourself some credit since you’re off to a good start.
Clothing: everyone is different and only you know your own comfort levels. I personally prefer more multitasking gear and a sleeping bag liner is a unitasker. Maybe leave it behind and keep the extra layer of fleece and just wear an extra layer of clothing at night when it’s cold.
Clothing II: in the summer, it’s all about having something dry to sleep in. Sweat and rain are the main challenges, so I’ll always keep a pair of running shorts and t shirt just for sleep.
In the winter, sweat isn’t that huge of a deal and it’s all about having the right number of layers to keep you warm, particularly when you stop moving for the night. I suggest you go on as many cold and even rainy day hikes to see what your comfort level is. For me in temps from about 30-55 I hike in long pants, t shirt, a light merino baselayer, and I use my smart wool neck buff for my neck and ears . I keep a fleece top and beanie handy for stops. In my pack I’ll carry my down puffy, an extra thermal top & bottoms for sleep, and I generally use my OR Helium rain pants for colder weather. In all honesty as long as I’m dry, I’ve just slept in my day clothes and never needed the long underwear unless it gets colder than about 30 or so.
If it’s below about 25, I’ll add an extra fleece top and take heavier weight (actually the mid weight versions) leggings. I don’t have much experience below 20 degrees other than a handful of nights.
Camp/water shoes: here’s what I have. I’d also look at the other thread about the “original” lightweight crocs. ALEADER Men's Pull-On Water Shoes Brown 9.5 D(M) US
https://www.amazon.com/dp/B01D7IJ5TS..._3q5hCbC787VC2
They’re cheap ($17), fairly light (10 oz I think) and comfortable. They are all plastic so they don’t really breathe but they are very well ventilated. They had a strong plastic chemical smell so I just let them offgas in the sun for a couple of days. They are better than crocs for water crossings (crocs tend to float away), but on the AT you don’t have any real water crossings outside of New England.
I gotta run for now. Biggest advice is for you to get out and find out what system currently works for you in colder and wet weather.
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