In an interview at Refinery29 Arianne Phillips revealed she will be doing the costumes for Madonna's forthcoming world tour.

Are you working on her costumes for her upcoming tour?
"Yes, I am going to be doing the costumes for her tour. You know, it’s top secret, but it’s going to be the most incredible tour of all time. You can get a hint of that from the Super Bowl, although it won’t look like that at all. The level of commitment she has with putting on a show is unlike anyone else."

Source & Full Interview: Refinery29