Using A Double Lengthwise Fold In The Pattern Cutting Process
A double lengthwise fold is used when many of your patterns are cut-on-fold style, or when your fabric has a center crease line that needs to be avoided. This is also another convenient way to fold fabric when working with patterns that require double or multiple cuts.
The difference between a full lengthwise fold and a double lengthwise fold is that a double fold provides two folded edges which can accommodate additional cut-on-fold patterns.
A double lengthwise fold requires both selvage edges to be folded toward the fabric's center. Keep in mind that the two folds should correspond perfectly on the lengthwise grain. Thus, you should measure the initial fabric fold width to ensure that its selvage edge is parallel to the fold line. Once the initial fold is perfectly parallel, bring the other selvage edge to the center so that it abuts the first one creating a perfect alignment down the middle of the fabric as shown above.
Note: In the folding process, fabric face sides should be touching such that all transferred pattern marks end up on the fabric's wrong side.