Petite Underwear

MyTights
Range of petite stockings, tights, hold-ups from Falke, Levante, Gio and La Perla as well as Spanx Magic Knickers.
Wacoal
Range of petite bras designed to petite proportions.
Little Women
AA, AAA, A and B cup sized small lingerie made exclusively in small bra sizes. Specialising in 28, 30, 32, 34, 36, 38 and 40 AA, AAA, A and B cups with a full range of flattering and feminine petite bras and petite swimwear. Most ranges are exclusive.
Amazon.com
At present Amazon.com only ship clothing to the U.S., offering a range of Petite underwear brands including, Lily of France, Eddie Bauer, Wacoal, Hanky Panky and Olga. However Marketplace merchants may ship internationally, check individual details.