SW1567 Panache Serenity Midi Bikini Brief. A flattering, modern and elegant midi brief, what more could you want?. This midi brief is brought to you from the Serenity collection by Panache. Here was can see a simple black midi brief that clings to the waistline helping to flatter your curves, as well as descending to a moderate to full rear coverage to ensure that elegant yet glamorous style of little cheeky exposure.