Here's a thing to try? Hare Scrambles.

[Sully]

Jeans would probably be ok but I also ride a street bike in jeans and I'm sure there a people against that. I always liked my MX pants (Thor is just or was just my goto brand). they provide a little padding on the hips (not a lot but better than jeans) and they are thick and tough feeling(like I wouldn't worry about much tearing through them in most impacts. Mine are almost 10 years old so idk what they are like now but mine also have leather in the spots where they would be exposes to engine heat like the side of the calf's. And they have thick rubber decorative logos in smart places like the knees for a little more protection. They nay even have the rubber by the tailbone area. They are definitely designed to be worn with a high trail or MX boot. I dont remember if you said you got those or not but definitely get some. They give you a lot of support and would prevent most ankle injuries from low speed falls. (Probably most high speed too)

Edit: the MX pants also fill in the space in the boot to prevent chafing, no need for long socks.

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