pale blue plus size dress - Tiered Gauze Maxi this popover Bardot Dress Pale Blue Skater
Description
Sizing might have change but there are a lot of helpful reviews on their site

Have your child looking their best in this classic fit, comfortable, and easy to wear tuxedo shirt

As she went to dance the night away with a slew of other famous faces, she changed into a more party-friendly draped blue gown
When a black tie dress code is set, the attendees are expected to be dressed formally