Heading over for 2 weeks form December 18th until January 2nd. Getting to majority of the sites and NBA, NHL, NFL, operas, day tours and 3 day tour to Washington DC, Philadelphia and Niagra Falls. I've been reading mixed comments about the best type of clothing. Some say layers, layers layers while others are just some simple thermals, jacket and good walking shoes. Temperature is meant to be around from 6 degrees and down to -2. Anyone from here been over at this time and what would be some good places to look for clothing and shoes? Appreciate any help.