Fashion Glossary: Princess Seams
Princess Seams are a variation of a dart. They work as a sort of 2-in-one dart that combines the bust and waist darts into one long line along the front or back of a garment in womenswear.
While they can be found on the bodices of garments, they can also act in place of a waist seam in a dress or gown if the seams are extended to the hem of the garment. A seam fit for a princess!