Seen very early in the A Scandal Belgravia, the viewer only catches a glimpse of the very sophisticated and gorgeous lingerie dress. The short peak we get at Irene Adler allows the viewer an early judgment on the character. The costume helps the discerning viewer start to understand who Irene Adler is.
The dress comes from Agent Provocateur Soiree spring 2010 collection, a line that is very high quality with interesting embellishments. The dress has a bias cut in the front and back that connects to a hip high slit, long sleeve, and a cowl type neckline. The lace dress never went into production sadly but it can be seen here.