A smocked bishop dress is one of the most traditional garments for little girls and babies. For a bishop dress to be authentic, it must be smocked by hand at least at the neckline. Other sites for smocking might be the hemline and sleeves. You will typically see the dresses are longer in length.
Length from the bottom of the neck to the bottom of the hem (may vary slightly):
These measurements are taken on the insole (the inside of the shoe).