Maybe I'm wrong about the ties - I haven't been in a class at NYU. But just go with stuff like in your picture (many outfits - at least 4-5 dress shirts, 2-4 pants, 2-3 sweaters and a couple pairs of shoes. So you have a bunch of combinations. Maybe a couple polo shirts. If you see other kids with ties, add them - that's easy. I wouldn't wear one the first few days at school. It'll also be hot in NYC in September.