Georgetown Interview attire

So the website states that we are NOT allowed to wear an interview suit to our Georgetown interview. Anyone know what people have worn in the past or how we are supposed to show up to this thing?

i interviewed there last year. guys wore dress pants, button down shirts, not all wore ties. Girls wore either pants or a skirt, with a nice top/button down shirt, etc. Nothing outlandish. They just want a way to tell people apart. A lot easier when everyone is not wearing the typical black/grey/navy suit. They take a pic too if I remember.