If you find yarn of the

If you find yarn of the similar thickness as No. 10 cotton you should be able to get the same size as your pattern but depending upon the fiber, it may drape or handle differently when you work with it.What are you planning to make?  Drape will probably be more of an issue with a piece of clothing. I know that No. 10 cotton is often used for doilies and counterpanes.  Cotton or linen are great for doilies.  I'm not sure how other fibers would work for it.  Another fiber, including acrylic, might make a lighter blanket if you plan to make a counterpane.