Petite Underwear

Figleaves
Figleaves have one of the largest range of underwear on the net, with briefs starting at size UK6 and bras starting at 28" back size. Their swimwear starts at size 8.
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.
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.