I recently bought this dress, it's amazingly flattering on my squishy size 18-20 body (much better than the pics would suggest!)
Hell Bunny Patricia Dress
And such a bargain too that I bought both colours.
I wore the black one with heels recently and felt fabulous. With a bit of dressing down I think either black or green could work for the office- is it just a case of wearing flats? Would tan wedges go with both?