Fun outfit. The blond hair and impish smile are nice accoutrements.
I would love to see this outfit accessorized with brown (or cordovan?) Buster Brown shoes. Would give it an 1870s to 1930s vibe.
Of course, were I a good cousin, I would buy those shoes myself; and arrive at Tate's house with a camera, a gaffer, an assistant lighting director to handle the bounce*, a little squeaky toy, a butter cookie, and apple juice. And a photographic documentarian: Cousin Bob.
Sadly, I am kind of a suck eggs cousin. Mainly because I refuse to hire a union gaffer.
*"the bounce" = a light reflector on a movie set. Thx to @brookedodson