Garment Grids are some kind of platset in which you can put a set amount of dress spheres depending on what Garment Grid you are using. A Garment Grid is very much like the Sphere Grid from Final Fantasy X... you place little markers down to learn abilities for v. A Garment Grid also allows the girls to use special abilities from other classes or have a stat boost during combat. When you move on your Garment Grid, during battle that is, you can also gain a stat boost or a new ability to use. When you change into all Dress Spheres on the Garment Grid during the course of one battle, you'll be able to use your special Dress Spheres.