36" inside leg and honestly I've never found any leathers I've been happy with the fitment of. I'm honestly convinced unless you go custom the trousers are impossible to find (and slightly unrelated but good luck with a one piece!)
I've been wearing a set of Rev'it axis textile overtrousers for nearly 3 years, because they have full length leg zips they zip over the top of boots/ whatever trousers or shorts I happen to be wearing which considering I use them for work/ running errands, touring, riding to bike cafes and the odd jolly they've been the single best investment I've made. 2 offs in them and the armour/ abrasion resistance has performed well.
Waterproofing has gone but I wear military surplus goretex overs anyway.
If you're not set on leather I would highly recommend them.