I used to wear long lycra pants but they got so worn out and I haven't been able to find any more so I switched to the t-shirt material. They aren't nearly as slick in the saddle as the lycra. Plus, I looked like a watermelon in a grape skin in the lycra pants. The others are thankfully a little looser.
Oh - I wear the lycra shorts under my pants... And I think the pants you wear are the same as what I wear.... stretchy stirrup pants that are sortof t shirt material.