DINNIGAN’S DESIGNS: Collette Dinnigan may have shut her premium business a little over a year ago, but the creativity keeps flowing. WWD has learned that the designer is collaborating with Anthropologie on a clothing collection that will land in stores in April — on both sides of the Atlantic — and is also working on a 25-year retrospective exhibition. The show will open at the Museum of Applied Arts and Sciences, known as the Powerhouse Museum, in Sydney, in September. That same month, she’ll also have a lingerie line launching in Australia under her Wild Hearts label. Last week, the designer was in London to launch her memoir “Obsessive Creative,” which has already come out in Australia.