savvyseams.com/techniques/canadian.php

Canadian smocking is a very quick and easy way to elegantly gather fabric. Use it in home dec projects, accessories, bags, or clothing.
You can find Canadian smocking in the SavvySeams Tudor Rose Purse pattern. You can find some examples of beautiful costumes that use Canadian smocking at the Padawan's Guide to Star Wars Prequel Costuming. Check out Padme's nightdress and robe in particular.