For what it is worth, I wore a blouse and slacks. That is what you will be wearing here when you are in blues (at least for the first year), so just keep that in mind. Be comfortable in whatever you choose to wear though because the last thing that you want to do is be uncomfortable in what you are wearing and and constantly have the worry in the back of your mind about what you are wearing. I chose not to wear a dress for that specific reason. I knew that I would not be comfortable in that, so I didn't want the extra distraction.