For the 18×18 100% cotton cushion cover with piping, featuring a yarn-dyed pinstripe front and solid-dyed back, here’s how I’d price it:

• Design details: The piping adds refinement, and the yarn-dyed stripe is a higher-quality textile treatment than printed stripes (color penetrates the fibers, lasts longer).
• Brand fit: The monogram motif and tailored pinstripe sit well in your Ralph Lauren–style heritage collection.