Probably too fancy for the office, this is most likely a cocktail dress of sorts.
The dress is by Apt. 9, from Kohl's in May 2013; the shoes are Christian Siriano "Shanghai" neutral peep-toe pumps, from Payless in April 2011. Other accessories are a floral headband, silver and chunky jewelry, and natural hose.
And a portrait:
More pics on Flickr; three outfits from last Thursday still to come; and don't forget to choose the man you'd love to see feminized (details here)!