Translation

アクセサリー / 付属品 / 共犯者

Meaning

An item that adds convenience, attractiveness, or usefulness, but is not essential.

Examples

• A handbag is a common fashion accessory.
  A handbag is a common fashion accessory.
• The car comes with several optional accessories like a roof rack and a GPS system.
  The car comes with several optional accessories like a roof rack and a GPS system.