Kind of low tech I guess, but I mostly just wear oversized outer garments that allow me to adjust for what/how much I wear for base layers dependent upon weather. Most of the time I'm just wearing mil spec bdu pants and tops (nylon/cotton ripstop blend) in the old woodland pattern. Very durable, well stitched and reinforced in needed areas, and nice pockets. Sometimes I'll wear an oversized mossy oak variation as a top before things really green up well.