Final answer:
The statement about accessories in costume design is false; accessories can include a wide range of items that complement a costume, not just those that attach.
Step-by-step explanation:
The statement that only something that actually attaches or pins to a costume piece is considered an accessory is false. An accessory in the realm of costume design refers to items that complement a costume and can include a wide range of objects, not just those that physically attach. Accessories can be items like jewelry, hats, belts, shoes, wands, or even handheld items like fans or bags. These pieces play a crucial role in conveying a character's personality, status, or style within a performance or production.