Woodbury Commons is just an hour drive outside of Manhattan and it’s a whole little nice village filled with 220 stores that sell designer clothes at really low prices, see the list of all brands here –
www.premiumoutlets.com/outlets/store_listing_map.asp?id=7
You can probably plan that you need at least 3-4 hours here to have enough time to go through all the shops.
It´s best to focus on American designers like Calvin Klein, Donna Karan, Ralph Lauren, J Crew, etc.
At Woodbury Common the prices are substantially than in Manhattan.
www.premiumoutlets.com/outlets/outlet.asp?id=7
Buy your bus ticket here. Adult: $42 Child: $21
Web special: Adult: $37 Child: $16
www.citysightsny.com