Final answer:
The subject of this question is History. In medieval times, silk was a popular fabric used for royal garments, known for its luxuriousness and association with wealth and power. An example of a royal garment made with silk is the Coronation Mantle.
Step-by-step explanation:
The subject of this question is History. The student is asking about a type of fabric that was used for royal items such as robes and coats for officers and kings/queens. In medieval times, silk was a popular fabric used for royal garments, known for its luxuriousness and association with wealth and power. One example of a royal garment made with silk is the Coronation Mantle, which was created using fabric from Byzantium or Thebes, samite, silk, gold, pearls, filigree, sapphires, garnets, glass, and cloisonné enamel.