Draper was used in the 60's by my nana in ireland, to describe dress shops. a draper was a better quality shop, (and echoing Bingley here,) would custom make dresses, or stock fancy items rather than the "off the rack" or ready manufactured clothing. so drapery would much more likely be evening clothes, or other fancy attire. so it was used your side of the pond at one point Jo. it might be old fashioned.