I wish you luck on your Rose costumes. I adore them, and hope to try my hand at one eventually too!
This is about as close as I could find:
http://www.fashionfabricsclub.com/catalog_itemdetail.aspx?ItmID=H686You might also want to try looking at this site. This person makes many of the Titanic costumes, and lists all their favourite fabric and trim resources in their links page. One of them probably is the supplier for the fabric they use for their version of the boarding costume.
http://www.moviegowns.com/links.phpAlso, if you're willing to go to all that work with the ribbon, another idea might be to sew in the pinstripes with thick thread (e.g. embroidery thread).
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