Sue:
That's exactly what I ended up doing...going larger rather than smaller. I get gauge with a #9 needle and like the texture of the fabric. What threw me off was the clerk at the yarn store thinking the two yarns weren't interchangeable and that I'd need a much smaller needle. (She thought the Plymouth cotton blend was much smaller than the Cotilde cotton blend. They're both worsted weight and apparently very similar.)
Thanks for the reply.
Judy