There are many stores online that sell women's clothing in size 18. The two stores that I find to have more plus size women clothing in stock is Avenue and Macy's.

You can find women's clothing basically any where the mall, department stores, specialty stored, corner stores any place you can think of they sell it.

Women's Clothing and LuLus are two stores that offer women's fashions online. One can also find women specific clothing stores locally by searching the yellow pages.

There are many clothing stores in Long Island that sell plus size women's clothing, you can try Macy's. You can contact them at (631) 724-4900 for more information.

The best stores known for selling women plus size clothing according to the Huffington Post are ASOS Curve or Saks. There are few brick and mortar stores that sell plus size clothing.