Since I answered this thread, I bought another pair of running capris by a company called Alo. They make yoga stuff, but these are not flowy capris. They have a higher waist than other capris and are very compressive, even though they don't feel lycra shiny. I love them.
And when DH was running behind me, he told me my bum looked smaller . I am totally sure it was the capris, not the body.