This isn't a costume, it is a Shoebill Stork.
Typical height range is 43-55 inches, some as tall as FIVE FEET. Length from tail to beak can range from 39-55 inches. Wingspan is 7 FEET 7 INCHES to 8 FEET 6 INCHES.
(Average WEIGHT is only around 11-12 pounds.)
Imagine having someone dressed to look like THIS and THAT size showing up at a party of 5-year olds!
Sort of more like DRACULA than "Good Luck Fairy"!