A "scalloped hem" refers to the bottom edge of a piece of clothing, such as a skirt or a dress, that has a wavy or curved pattern instead of a straight line. It resembles the shape of scallop shells found in the ocean. Full definition
Alluring crop top with hook - and - eye details at the collar creating a cutout features sleeveless style, delicate laser cut design and scalloped hemline, while shorts features an elastic waist, laser cut and scalloped hem details also. (zaful.com)