M.C.
A nice pair of dark dress slacks/pants, dress shoes, and a nice top or nice top with crop sweater or jacket would be fine.
Follow this link. It leads to 4 pages of 'suit seperates'. Any combination would work. http://www.dressbarn.com/womens/suits-separates
If you decide to wear a skirt. wear pantyhose. Nude hose would be fine.
Shoes: wear nice dress shoes that have a back. No mules or flip flops.