4.4 Yarn Numbering System: Yarn numbering systems are therefore used to express a relationship between a unit length and weight of yarns. There are two main numbering system in use. 840 yds=1lbs=1S Numbering system Matric No. English No.

After deciding where the pattern needs to be altered, draw a straight line as a guide for cutting the pattern. For most alterations make the line parallel cut along this line as needed, so that it will spread out flat. If your are lengthening or shortening an entire pattern piece, you will need to cut the pattern all the way across and increase fullness entirely through pattern. Before cutting, draw two short lines a few inches apart, at right angles to and across the cutting line. Then match these lines when you spread and place the pattern, keep the pieces in correct position.