the key was missing , presumed lost , so the door swung open , revealing another mirror , the silvering dying from underexposure to light , and shelves labelled in black letters : s o c k s u n d e r g a r m e n t s g e n t l e m e n ' s r e q u i s i t e s and allowing that familiar 'old wardrobe ' odour to leak into the room .