Possible Clues:

• Provide substitute pieces of material
• Substitute for (someone)
• Swap out
• Substitute fabric left with expert
• Succeed by record length in running competition
• Substitute crêpe filling with something dainty
• Swap corded cloth with finer material
• Salesman with decorative fabric giving change
• Return to compete, securing record by end of April
• Agent with fine material as substitute