Grainline by Olga Balasa | Jul 19, 2017 The line of fabric that moves at a right angle to the crosswise grain is the lengthwise grainline. This thread runs the entire length of the fabric and is parallel to the selvage. Submit a Comment Cancel replyYour email address will not be published. Required fields are marked *CommentName * Email * Website This site uses Akismet to reduce spam. Learn how your comment data is processed.