These portraits of Queen Caroline's daughters show formal dress that can be dated to 1728.
Princess Royal Anne (center) married. Images of her and a link to a biographical article can be seen here. Princess Amelia Sophia (left) did not marry, nor did Caroline Elizabeth (right). An image of Princess Amelia can be seen here.
From tumblr.com-search-18th+century; size fixed at 38.55 cm high at 28.35 pixels/cm.