My general rule of thumb is to walk in shorts and tee shirt ( Or polyprops) and have a walking warm top avaliable plus. Parka hat and gloves. and to have a complete set of clothes including underwear and long pants to put on once at the camp.
Pack
pack liner
Parka (Good Quailty WaterProof)
Personal Hygiene eg tooth brush etc
Plate
shorts
sleeping bag & Optional Liner
Sleeping Mat
spoon
Sun block
Sun Glasses (Optional)
Sun Hat
torch,
Trail snacks (Scroggen etc)
tramping boots or solid footwear
trousers and / or long johns, ( You can walk in long jong if you feel the cold a lot.
Underwear
Warm Hat
water bottle or drink system I find the one I use for cycling with a hose awesome.
Woollen fibre pile: shirt, jersey
You will need some room in your pack to take some party gear and food
