Grading is the pocess of proportionally increasing or decreasing a master pattern according to a prescribed set of body measurements. Each piece of pattern is shifted and traced step by step while at the same time the original style lines of the pattern are maintained. It is the skill, for instance, of changeing a size 10 into a well fitting size 14, without losing the style proportions established by the designer.
The diagram above shows how a basic bodice pattern is increased in size evenly throughout the whole pattern, by using a specific "grade". The increases or decreases of measurement between the sizes is referred to as the grade. The grade varies according to the type of measurement: circumference, length or width.
Source- Grading Techniques for Modern Design by Jeanne Price & Bernard Zamkoff
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