Hilarious!!! Yeah, that's about how it goes. I really miss On Course breeches. I know people who had theirs for over 5 years, myself included.
I've ridden in jeans, "jeggings", yoga pants, breeches and riding tights. You can ride in whatever you want, but just as with all things in life, there's something to be said for *well made* tools of the trade. And it does help if you find the tool you feel was 'made for you' (or literally was made for you, in the case of custom items). It makes me chuckle when people mention the purpose of English apparel is to look conservative, neat and tidy. Much of English riding tack and apparel is about minimalism for athletics and communication between horse and rider, while maintaining comfort and support for both. That just happens to go hand in hand with conservative, neat and tidy. Breeches and riding tights are supposed to offer the rider a 'second skin', meaning close contact (for all the usual reasons close contact is a factor in English riding) and flexible support. Knee patches and full seats offer additional grip and reinforcement that doesn't get in the rider's way. Furthermore, breeches and riding tights allow judges and instructors to see your leg clearly and assess your riding position. So far, I've only been able to achieve all of that with breeches or riding tights. Some jeans offer much of that checklist, and many don't. and you end up with uncomfortable seams, fabric bulges, fabric riding up, and weird restriction in movement due to lack of stretch. Sometimes, you have to feel it to believe it. BUT yes, just like with any clothing, you do have to find the right breeches/tights for you...in a world where style, fabric, and sizing are all over the place. Fortunately, if you like jean material, some brilliant person thought of jean breeches, including full seat and bootcut...so those now exist. I haven't tried them yet, but I'd certainly like to.