Ok, thanks for telling me what to even call the light weight ones. I did find a pair on ebay so I'll get to try some very soon. I just can't help but think they are going to be more comfortable than jeans, as much as I love my jeans.
My gelding is tall so I really have to hike up my leg to get on, and jeans bind.
And altho it's probably going to be super weird looking, I'm going to continue to wear my western boots since I love them very much. They aren't real tall, but I hope they go up enough for the breeches. In my area, i'm more certainly going to be odd-man-out with this get up!