OMG!!!! I need help pLeAsE?

i'm going to nyc for a school trip on monday, and we're riding the ferry to ellis island. The high temp. is supposed to be 59 degrees F and the low is supposed to be 47. Should i wear a coat like this (http://store.delias.com/item.do?itemID=51809&categoryID=2191&sizeFilter=&colorFilter=&brandFilter= )? any suggestions?