Sit up riding position allows me to wear a 2/4 length, and lets me enoy the slightly increased warmth, weather and wind protection . ..
semi-race crouch dictates a waist length jacket -- if not zipped to pants, more wind hitting your lower back, greater chance of weather incursion, all things being equal.
"Here is your country. Cherish these natural wonders, cherish the natural resources, cherish the history and romance as a sacred heritage, for your children and your children's children. Do not let selfish men or greedy interests skin your country of its beauty, its riches or its romance.” T.R.