The patterns almost certainly would still belong to the designer of the sweaters; and in addition, basing patterns or materials on what you tore out of the magazine would probably be a violation of the magazine's copyright. Or, at least this would be the case if you intend on selling reproductions, copies, etc. of the pages torn out or of the patterns themselves; the intellectual property inherent in the patterns or pages would still likely belong to the companies. On the the other hand, if you are reselling the actual physical pages torn out, and not reproducing them, that is something you could do, since a person who buys a book, magizine, etc. can physically resell it.