Sophie, Duchess of Edinburgh, stepped out for an evening of classical music at the Royal Albert Hall on Tuesday. The orchestra was performing at the BBC Proms, one of Britain’s most celebrated annual classical music series. For the special occasion, Sophie wore a festive red floral dress by Matelier, complemented by gold jewelry from Tiffany & Co. and Giulia Barela. First staged in 1895, it is one of the largest and most prestigious classical music festivals in the world, attracting audiences from across the United Kingdom and internationally. The festival typically runs from mid-July through mid-September and features dozens of concerts from orchestras and music ensembles from around the world.