An ornament worn on the chest (such as a brooch); a decorative accessory for clothing.
彼女は祖母からもらった古い胸飾りをドレスにつけた。
She pinned the old brooch her grandmother gave her onto her dress.
礼服には小さな胸飾りをつけるのが正式だ。
It's proper to wear a small brooch with formal attire.
舞台衣装には大きな胸飾りがよく使われる。
Large chest ornaments are often used in stage costumes.