Kashmere, I hear you!
I ride one about 4-6 times per week (depending on other life activities) and groom myself. I don’t have to do other barn chores but I often do because I like them and I want my horse to have a good stall life. I only really have 3 breeches in my regular rotation (I have more but some are seasonally dependent, tights vs. heavier cotton breeches). I wear one pair at least at week, sometimes longer, before switching to the next pair. I throw one or two pairs in my laundry every time I do it so I always have something wearing in the rotation. I look at breeches like jeans; wear them until it’s not bearable anymore. I hang them when I get home so they dry from sweat and they are dry in the morning. Even clean breeches don’t stay clean for 5 minutes after arriving at the barn. So I don’t worry about cleaning them too often.