I'm a paralegal and work in a court house often, you are fine with either a pant suit or a dress suit. The unwritten rule in a court house is to where a suit jacket, even women because it shows respect to the Judge. But since you are visiting an office within the courthouse I imagine that would be up to you. No open toe shoes. I would go with a brown or navy blue. Keep it conservative, no wild patterns that are distracting. Good Luck I'm sure you'll do great!