Anything that spans across multiple months and thereby multiple temperatures means it works crazy hard. In order for that to happen, key elements have to be in place. The color needs to be the good neutral - some colors in specific fabrications dont feel the same in January as they do in June. Brown is a good neutral in that way as it adds depth to traditional winter colors and balances out brighter summer hues. The fabrication needs to have enough strength to stand up to colder months, but sans hair. Worsted wools tend to be smooth in texture but have strength and definition. The natural fibers breath and work in different climate extremes. The fits need to be relaxed and easy for layering, armholes dropped and conducive for adding a cozy knit underneath. Wider pants allow for layering of tights for warmth but give breeze in the spring. A slim wool based pant in June can paste to your legs. Not my thing
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