Ok for the first outfit, I went with nice jeans/pants, a sweater, oxford flats, and a purse. This outfit is preppy and very collegiate! This outfit is nice, but does not look like you are trying too hard at all. Also it doesn't make you look like an "obvious high schooler" (not that that is a bad thing), but this outfit is mature (you know what I mean?). Also make sure to wear comfy shoes in case you are going to walk a lot.
Finally, a skirt, a blouse, a sweater, and booties are another great outfit. I really love this top. I think it is great for a college visit.
I hope this helped you all! Please comment or email me if you would like to contact me!