Each show has a theme, which can include a variety of rules, ranging from "warm colors only" to specific colors and fabric patterns. Notably, only the garments themselves count toward earning credit toward following the theme, not the accessories that may also be included in an outfit.
Each show has a central idea, which can encompass a range of rules, including "exclusively warm colors" or specific hues and fabric designs. Notably, it is only the clothing items themselves that contribute toward earning credit for adhering to the theme, whereas accessories that may accompany an outfit are not considered.