Bandana - Madewell - great for getting hair off your face when it's hot in the city and still really cute.
Dress - H&M - When it's 38 degrees you want something light and this dress is perfect.
Bag - TK maxx but the brand is Sparrow True - Ok for New York you want a fairly small bag that is easy to carry. My Longchamp is far too big and hurts your shoulder after a while. This bag is easy on your shoulders, a good size and it's on your body so it isn't likely to get stolen.
Shoes - Next - Probably the most important to get right in New York because your going to have to do a lot of walking. Flip flops are a bad idea, I learnt that the hard way my last trip here a few years ago. They give you blisters and are not practical. These shoes are similar to toms and they are comfortable and light too - the perfect option.
Nails - Barry M blueberry.