Any pattern you purchase as a PDF would work just as well as a paper pattern purchased in a store. You just need to make sure that your printer doesn't change the size, and you print it at 100%. Almost every PDF pattern I have used has something on it to measure to make sure it is the right size... eg a one inch square when measured is actually one inch after printing, and the pattern will work out. If that square is not one inch, then you need to determine what needs to be changed when printing to make sure the pattern prints at the correct size. Usually there isn't any problems, but some printer seem to have a mind of their own, and don't want to print actual size.