Related Clues:

• Rough stuff
• Woolen cloth
• Charon's river
• An oath on it was once held to be inviolable
• Jacket material
• Charon's crossing
• Suit material
• Preppy's fabric
• Underworld flower
• Crossing for Charon
• River in Hades
• Jacket choice
• Where Achilles was bathed
• Name on which ancient oaths were taken
• Classic suit