I bought Devon-Aire schooling tights last year in the beige and grey. They are sweat wicking and breathable; this will be my second summer riding in them. They work well for me, and are much more comfortable in Mississippi's wet heat than riding in my wranglers. My butt stays dry at least, even if the rest of me isn't by the time I'm done with 2-4 hours of riding in an arena, or on a trail ride.
I also wore them through the winter, and they did really well layered under my jeans in the super cold, or by themselves in the mild cold. Once I was working, I stayed warm and dry. So they serve as my do all riding pants. As for panty lines? Well, invest in some thongs hahaha.
Think of it not as a failure but as a success in how not to do it.
Don't look in a horses mouth for a gift.