I got some scars on my calves from jeans, so I Never ride in jeans-I use English breeches-plenty of stretch & lots of choice in color & texture, & I wear my tall black English boots, & nobody (other than a previous husband) has had any problem w/my attire.
I wear Wranglers - Q-Babys are my favourite, especially Dark Dynasty (These seem so much nicer than the other colours/fits, not sure why!). Just got a pair of the new Booty Up jeans from Wrangler that I also like. I have about 5 or 6 pairs of Wranglers, I wear them at work everyday as well as riding. I wear through the knees of them first.
Today I bought a pair of RM Williams Legend jeans - I don't normally look at these as they are $$$ but I got a seconds pair for $65 down from $169. I'm loving them so far, they feel really good quality and like they will last, and the fit is a little better on me than wrangler. I have a big butt so to fit my butt the legs can get too loose, if they fit my legs the waist is too tight. These aren't too bad.
I ride in whatever I have on that day if I just drop by the barn, but if I plan on going I ride in my kerrits riding tights. Otherwise anything from my Sevens to Amer. Eagle to Hollister to yoga pants to leggings.
I ride in Riders by Lee in boot cut during the summer because they are the most comfortable jeans and they seem to hold up pretty well but because of the winters around here I wear leggings under carhart reinforced mens pants, they are so nice and warm and they repel water which is great because I live in the pacific northwest where is rains all the time?
Jeggings-just like breeches, I love to ride in them! And they're really comfy, stretchy, and you can really feel the horse under you, versus other jeans so far, but they are a bit thinner if you don't like that. Mine have held up well though.