Agree on his low, low cost ideas - a good treatment of layering and selection of versatile fabrics. He is absolutely right about military clothing - low cost and practical. I would change a bit and argue for at least some articles of bright clothing.

Doing SAR, I have spent days looking for folks dressed in subdued colors and they can be really hard to spot. Even a right handkerchief or bandanna can make a difference, but more is better, especially if you are immobile...