You look great in these, Suz. It's too bad they aren't your holy legging grail.
Just for a little commiseration: My Eileen Fisher skirted leggings slide down on me. And a new Hue pair does, too. It's annoying, yes, but for me, not enough to not wear them. Like Una, I just pull them up and move on. Worse for me are the NYDJ ponte skinnies that look quite a lot like leggings on me, despite the thick ponte knit, fly front, back seams, etc. Boy, do those ever slide down. I'm thinking I may be having some of your problem with them--my guess is I have too much thigh and not enough behind to keep them in place. Those drive me crazy. But I love the color, so I wear them. They seem to do slightly better with a belt. Yes, belting a pair of legging-like pants seems just a bit, um, counter-something, doesn' it??
(And keep in mind, this is from the woman who has just adopted the mantra, "No more mediocre clothes." Hmmm.)