If you have the Blue Dragon Feet on they will be visible on your Penguin BUT…
…on your Player Card you will see the White Sandals!
…Thanks Nelsonbob101 and Trainman1405 for telling about this Bug :) I hope Club Penguin will fix this Bug soon so the Blue Dragon Costume doesn't have to look so silly on the Player Card!
UPDATE: March 15, 2012 Thanks surgex10 for telling me that this Bug now is Fixed :)