Hips and Curves lingerie and nightwear is aimed at figures of US 14 and upwards
This site was pushed to me the other day, which might prove useful for larger ladies who haven't given up the ghost.
Hips and Curves specialises in sexy lingerie, corsets and nightwear for women with 'hour and half glass' figures. The range also includes footwear, dress-up costumes (French maid's outfit, etc) and daywear, including several nice examples of bootcut jeans.
Clothing starts at US size 14 (UK 16) and goes to US size 24, and a full sizing chart is included, so you can work out where you are. International shipping available.