The best I've found are Natori Bliss Girl Briefs, which I think are actually the same as what Elly linked to, despite Nordstrom calling them bikinis. They are invisible under almost all clothing I wear (they do not work under yoga pants or leggings).
Since I can't afford a drawer full of those, I supplement with Aerie Boy Briefs. Yes, Aerie is directed at teens, and some of the patterns are childish/twee, but there are plenty of solid colors. Those with lace edges around the leg openings tend to be invisible under most clothes, though not quite as good under some things as the Natori.
I have a high hip to waist ratio, and both of these styles provide full rear coverage and don't ride up on me.