Linen is pretty great! It's not the best defense against a really determined mosquito (like the dreaded tiger mosquitoes that can bite through thick jeans), but it's at least a first layer defense, and it's really good for sun protection without overheating. Lightweight wool can be wicking and cooling in hot weather, too.
I also have a mix of old assorted outdoor hiking clothes and athletic wear, mostly from thrift stores, and I just rotate through them and wash them every week. If you don't care what hideous colors you wear outside in the yard, you can find a LOT of good quality outdoor clothing at thrift stores, much of it never worn! You just might wind up pairing fluorescent yellow wool socks with bright green pants and a coral orange shirt. I consider it a fashion statement!
