Summer wear has been pretty well covered here. I would add that good fitting quality boots are worth their weight in gold. And speaking of weight, for summer use go light. An extra half pound on the feet will drain you faster on the move than many pounds in a properly balanced load on the back.
Here is my cold winter input from another thread:
First recommendation is a base clothing layer of silk long johns; available at good sport chain stores. They weigh almost nothing, but add a degree of insulation all out of proportion to their bulk. Regular cotton long johns can be worn over silks if desired.
I like an intermediate layer of 100% cotton flannel; pants and a collared shirt (buttoned up to the neck, the collar can be turned up to cover the neck).
A quality pure wool sweater can be added as an intermediate layer depending on your state of metabolism.
Quality pure wool jacket and pants. I have a number of jackets; Harris tweed etc, and a particularly good pair of vintage brown wool Australian Army pants. Hold your pants up with (depending on what side of the Atlantic you went to school) suspenders or braces in place of a belt. A belt restricts movement, blood flow, digestion etc - you'll be far more comfortable without one.
Outer shell; wax cotton jacket is good if the freeze turns to rain unexpectedly. Otherwise I like a windproof cotton shell. Genuine Ventile cotton is excellent if you can afford it. Likewise overpants if desired; I have a pair of lightly insulated British Army overpants made of cotton or polycotton with Goretex interlining.
I like these combinations because if things warm up considerably into the day the outer items/layers can be shed one at a time.
Pointer: know your size and meaurements in general, feet and inches, metric and anything else - and browse the evilBay. I have aquired a number of very upmarket, very high-dollar clothing items, some new with tags, for a fraction of their retail price.
Surplus Russian military hats - the ones with the thick lining and wraparound flap are hitting the market in great numbers at this time. I have an old East German Army version that has served well for about 15 years but I am adding a couple of the new Russian ones. These hats are very warm and versatile; I've used mine in temperatures as low as minus 60 F.
Pointer: Scour the 'Bay, surf the web, keywords: Ushanka Russian hat. They are going for $10 to $25. Expect to pay alot for shipping if you buy from a seller in Russia because of their export permit costs etc. But they are well worth the money.
Best gloves or mitts are soft wool. Some of the best I have used are the traditional Dachsteins made in Austria. Although popular for winter mountainering they are suited to any cold environment. For shooting you can modify them (or have someone else) by cutting a longitudal slit in the right place for the trigger finger. The slit can be lightly buttonhole stitched to stop it fraying if desired. A lihter pair of gloves can be worn inside mitts, and of course additionally silk gloves can be worn as excellent liners.
The right socks are very important. I like quality wool, or brands like Thorlo of various materials and weights. Sometimes a lighter weight pair inside a heavyweight pair. Silk liners add comfort and warmth.
Best boots for lounging around in cold weather are felt-lined like Sorel brand etc. Make sure you buy them matched to the socks, number of sock layers, you will wear in them; and not too small. If you habitually wear your boots laced up very snug for walking or climbing, loosen them when you settle down to allow your blood to circulate more freely.
A couple of other pointers offhand; a closed-cell foam pad to sit on and lean against. In other words cover your seat or chair. It will stop the heat rushing out through the compressed clothing under your backside and back.
A versatile combination is a down parka and a child's sleeping bag. The parka can be worn - as an extreme cold weather jacket of course. Worn in combination with a child's sleeping back up to the waist one can have a pretty warm bivouac. When getting up for those middle of the night chores (like when nature calls) the jacket is already on, and one can don boots, or they can be worn loosely tied or untied in the bag.
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