My recommendation (as one who has not yet walked the Camino, but who enjoys hiking and lives in the Pacific Northwest where the weather is usually on the cooler side, but can vary) ... When I am hiking/backpacking, my preferred lower body combination is a pair of convertible hiking/trekking pants and a "base layer" (mine is Patagonia and is made from capilene). My preferred upper body combination is a tank top and a hiking/trekking shirt (variable sleeve length) with a "base layer" (long sleeve Patagonia capilene) for added warmth if needed. I am still working on my preference for if I need to be warmer than that (i.e., I don't have the "perfect" fleece/down/raincoat/etc. combo worked out yet). I tend to start out cold and warm up quickly, so much of my hiking, even in the rain, is usually in shorts (i.e., the legs zipped off the convertible pants) and a tank top. Since for the Camino I plan to get my pack weight down as much as possible and want something that dries quickly, I am still seeking the "perfect" tank top so that I can leave my cotton ones at home. Recommendations for tank tops, fleece (weight and brand), and rain gear would be appreciated. I'm a a function+versatility+mystyle seeker who understands that what works for one does not necessarily work for all, but it's good to have a good library of resources to select from. (My Camino plan has been bumped out to 2015.)