Devon Aire Cool Cotton breeches
Devon Aires are the most comfortable, stretchy schooling breeches I've ever owned! They are cool in the summer and warm enough for (Southern California) winter, and wash great...although I hang them to dry since I've had them shrink in the dryer. They come in several colors, and they last really well, considering I ride almost daily. I get them from my local tack shop for $56 a pair, which I think is great considering how much other breeches run.
local tack shop