A week ago, Robert Wun’s studio in the Dalston area of East London was buzzing with activity, as the designer prepared to stage a show for the first time ever — at Paris haute couture week, no less. Eight years after the launch of his namesake label, Wun had been invited to close the week as a guest of the Fédération de la Haute Couture et de la Mode. But as finishing touches were being put on a dramatic black quilted down cape and a…