 Costumes for the pilot were designed by BAFTA Cymru award @-@ winning costume designer Ray Holman . Cumberbatch wore a £ 1 @,@ 000 <unk> coat in the series . Sarah Arthur , the series ' costume designer , explained how she achieved the detective 's look . " Holmes wouldn 't have any interest in fashion so I went for classic suits with a modern twist : narrow @-@ leg trousers and a two @-@ button , slim @-@ cut jacket . I also went for slim @-@ cut shirts and a sweeping coat for all the action scenes — it looks great against the London skyline . " 
