Topshop onstage! Florence Welch performs at the Glastonbury Festival in a custom Topshop one-piece. Photo: Hayley Madden/Redferns

Runway designers collaborating with music stars isn't new. Britney was dressed by DSquared for her "Circus" tour and sadly, Riccardo Tisci of Givenchy was busy working on costumes for Michael Jackson's upcoming world tour before the king of pop's untimely death. Now Topshop?

This is one of the few times we have heard of a large retailer designing for music performers, but if anybody could break into the business of dressing bands, it'd be Topshop with its pulse on "fast fashion."

For Florence Welch of Florence and The Machine's Glastonbury Festival performance last weekend (June 27), Topshop outfitted the indie pop darling in a black one-piece with a fitted bodice and long fringe flowing from the arms that was anchored at the sleeve by a row of roses. The look had plenty of thigh exposure with the bottom cut more like a bathing suit, but it is the stage after all. If you've got it, flaunt it!

Topshop dressing music stars may also be a sign that celebs are cutting back (like Britney and her recession shopping spree). Or perhaps, with their talented design team, Topshop is making a natural progression towards more luxurious and customized fashion, something any well-designed label would do.

But who should Topshop dress next? We're thinking Lady Gaga would be a challenge, or perhaps Fergie with her killer abs. Who would you nominate for Topshop's next stage and design collaboration?