It looks rather formal, but it's really just a stretch t-shirt (with crystal trim) and a black mini-skirt.
Manufacturer/line/store: Jaclyn Smith (Kmart)
Date: December 2008
Manufacturer/line/store: Attention (Kmart)
Date: January 2011
Accessories are silver jewelry, silver belt, patterned tights and black patent pumps (previously catalogued).
Here's a portrait:
More pics on Flickr; monthly video and poll results coming up.