About your neck you will want to wear a silk kerchief. This is to keep out dust, and to prevent your neck from becoming reddened and chapped. It, too, should be of the best quality. The poorer grades go to pieces soon, and their colors are not fast. Get it big enough. At night you will make a cap of it to sleep in; and if ever you happen to be caught without extra clothes where it is very cold, you will find that the kerchief tied around your middle, and next the skin, will help surprisingly.
A coat is useless absolutely. A sweater is better as far as warmth goes; a waistcoat beats it for pockets. You will not wear it during the day; it wads up too much to be of much use at night. Even your trousers rolled up make a better temporary pillow. Leave it home; and you will neither regret it nor miss it.
For warmth, as I have said, you will have your sweater. In this case, too, I would impress the desirability of purchasing the best you can buy. And let it be a heavy one, of gray or a neutral brown.
But to my mind the best extra garment is a good ample buckskin shirt. It is less bulky than the sweater, of less weight, and much warmer, especially in a wind, while for getting through brush noiselessly it cannot be improved upon. I do not know where you can buy one; but in any case get it ample in length and breadth, and without the fringe. The latter used to possess some significance beside ornamentation, for in case of need the wilderness hunter could cut from it thongs and strings as he needed them. Nowadays a man in a fringed buckskin shirt is generally a fake built to deceive tourists. On the other hand a plain woodsmanlike garment, worn loose and belted at the waist, looks always at once comfortable and appropriate. Be sure that the skins of which it is made are smoke tanned. The smoke tanned article will dry soft, while the ordinary skin is hardening to almost the consistency of rawhide. Good buckskins are difficult to get hold of--and it will take five to make you a good shirt--but for this use they last practically forever.
Of course such a garment is distinctly an extra or outside garment. You would find it too warm for ordinary wear. The outer shirt of your daily habit is best made of rather a light weight of gray flannel. Most new campers indulge in a very thick navy blue shirt, mainly, I believe, because it contrasts picturesquely with a bandana around the neck. Such a shirt almost always crocks, is sure to fade, shows dirt, and is altogether too hot. A lighter weight furnishes all the protection you need to your underclothes and turns sun quite as well. Gray is a neutral color, and seems less often than any other to shame you to the wash soap. A great many wear an ordinary cotton work shirt, relying for warmth on the underclothes. There is no great objection to this, except that flannel is better should you get rained on.