Sweater or Jacket is essential all year. A synthetic like polyester or polar fleece is best. Hiking shorts when on the trail in warm weather. Long legged slacks for the evening and other cool times. Knit hat for cool days, evenings and early mornings.
Polyester is best.
Gloves or mittens will keep your fingers warm in the cool of the morning and evening. Lightweight two piece long johns are nice to have if your expedition is in the early or late season. A lightweight flashlight and a couple of spare batteries will ease the darkness. Lightweight binoculars are neat to shorten the distance between you and wildlife. If you like to lounge and read, bring a small paperback .