Madonna and Iconix Brand Group Inc. are ready to cause a commotion and dress you up at retail. The pop icon and the brand management firm revealed the formation of a joint venture called MG Icon LLC, which will bring multiple fashion-related projects to retail racks across America and around the world. The first initiatives under the agreement are a juniors’ line called Material Girl, which will launch exclusively at Macy’s in August. MG Icon is also close to announcing a collaboration with a designer label for a co-branded eyewear collection. “Joining forces with Iconix to bring my fashion ideas to consumers is very exciting for me,” said Madonna. The collection will be featured in dedicated shops at Macy’s. Madonna, Iconix and Macy’s will support the launch with a multimedia print and online campaign.