lingerie dress Black Lace Slip – Self Care Shop the Coquette collection is deliciously flirty and romantic. Butterfly Slip Dress & Robe

Indeed, if we connect the two squares, it becomes clear that the squares are identical shades: Below is another optical illusion based on color, as pointed out by New Scientist (which has an excellent dress explainer)

The first daughter's outfit feels like it could be harking back to the work of Adolfo Sardia, a Cuban-born American fashion designer who started out as an apprentice milliner at Bergdorf Goodman in the late 1940s and went on to be known for his spectacular hats, which were worn by Nancy Reagan to both of her husband's inaugurations

She sounds kind of similar in cadence and attitude and how outspoken she is

Closure: Back zipper