Madonna doesn't decide on her tour costumes until all of the choreography is in place.

Although the singer will wear Gucci, Prada, Moschino, Alexander Wang and Fausto Puglisi on her Rebel Heart tour, she keeps the designers waiting until she has finalised her dance moves in order to make sure the costumes don't restrain her movements.

Madonna's costume designer Arianne Phillips explained: ''[Madonna] doesn't really finalise any of the designs until 100 per cent of the choreography is set. It's a real back-and-forth conversation and it's a brutal process for most fashion designers. You're hanging in the balance while all the practical aspects are worked out, like the choreography and the quick-changes.''

Alexander told WWD: ''For her, the performance comes first. She has to be able to dance and move and feel comfortable in it.''

Arlene brought in Gucci's creative director Alessandro Michele to work on costumes for the tour and was blown away by his gypsy-inspired creation.

She said: ''I was completely blown away. I love his hand. His clothes are lyrical and feminine and they tell stories. I didn't know him, but I felt there would be this synergy to have them together.''

And Jeremy Scott was thrilled to be asked to work with the singer, explaining: ''Madonna is often like a director. She has a vision and you get behind her to achieve that vision.''