In a Dressage saddle, your legs are at very close contact with the saddle constantly, there is little room 'to breathe'. It's not about it being "oh sooooooo much tougher than Cavalry riding" (sheesh give me a break), it is the style of riding, the saddle of saddle. Wearing jeans in a Dressage saddle plain out hurts.
I mention Dressage because it is my discipline, not because I think it is "oh so tough". Please do not attempt to attempt to insult me. You have a small obsession with cavalry and it is brought up in near every post you make - am I therefore not allowed to use my own discipline in my examples?
Of course you can bring it up. But to suggest that dressage involves more use of the leg and that "BSMS, I would love to see you get through an hour lesson in a Dressage saddle, in a pair of baggy jeans. My lord!
", when folks have ridden for years in loose pants in a wide variety of demanding, leg-intensive riding just doesn't make sense. What is it about dressage that results in "chaffing, blisters, cuts and bruises from my ankle to my groin"? Just what are you doing with your legs? I thought in dressage, the legs were supposed to drape the horse, with gentle contact.
I used the cavalry as an example because it involved thousands of men, riding in the same uniform, and riding in a very demanding environment. I used it because it makes sense - if THEY could ride without injury, doing riding like that and using a style that puts a big emphasis on using the leg for stability, then there is no room for reasons like, "Loose pants make your leg go forward / legs chafe / lose position / etc".
This thread is filled with reasons why no sane person would attempt to ride a horse in loose fitting pants - except none of those reasons hold up to how people have ridden for years, except for this: "I like riding in them". That, by itself, is all the reason needed.