well, from the looks of the Euro tourists in NYC every summer you're probably good to go with black socks, running shoes or any flavor but at least 5 years old, check shorts and some ridiculous inappropriate shirt, most likely 1 that says I heart NY
you'll fit right in over there in that outfit
oh, and make sure that you walk 4 across on all the sidewalks, slowly, staring up at whatever catches your eye, during rush hour