What Is Pattern Grading in Garment Manufacturing?

Pattern grading is the process of turning an approved base pattern into a planned range of sizes. It applies grade rules, or measured changes at selected points, so a manufacturer can develop the sizes specified for an order. The exact rules depend on the garment, the base size and the agreed measurement chart.

Pattern grading is not the same as choosing sizes

A size chart states the target body or garment measurements. Grading is the pattern-development step used to create related sizes from a base pattern. A grade rule should therefore be checked against the chart; it should not replace a decision about the measurements a brand wants to sell.

What grading may change

Depending on the style, grading can change points such as chest or body width, length, shoulder, sleeve and neckline. The proportions are not universal. A fitted knit top, a relaxed sweatshirt and a children’s garment may need different decisions about width, length, ease and stretch recovery.

Construction can also affect the result. Rib, cuffs, pockets, closures, artwork and panel shapes may need their own placement or proportion checks instead of being enlarged mechanically.

What to prepare before grading

• An approved base pattern, or a sample and measurements that can be used to develop one.
• The base size and a complete size chart with points of measure, units and measurement method.
• The intended size range and any fit notes for the target market or wearer.
• Construction details that affect the pattern, including rib, cuffs, pockets, closures and artwork placement.
• Open questions clearly marked, including measurements that are still under review.

A sketch, reference garment or measurement brief can be a useful starting point, but it still needs interpretation and confirmation. Jiajia develops samples according to the customer’s requirements, which may include a sketch, reference garment, measurements or other project details. The resulting specification should be agreed before production.

Grading is different from fit approval

A graded pattern creates a planned size range; it does not prove that every size fits correctly. The base sample should first confirm the design direction. Then the brand and manufacturer can decide which sizes need a separate measurement or fit check. For knitwear, review stretch and recovery as well as the garment at rest.

Questions to record in a grading brief

• Which size is the base size, and what is the reason for choosing it?
• Which measurements are fixed, and which are expected to change by size?
• Should artwork, pockets and trims move with the graded pattern or remain tied to a body reference?
• Are there fit comments that apply only to one size?
• Which sizes will be measured or sampled before production approval?

How to review the result

Compare the graded measurement chart with the requested chart and record the version and date. If a point differs, state the point of measure, observed value, reference value and requested action. A grading table is a project document, not a universal rule for every garment.

For the information to prepare before sampling, read our clothing production brief guide. You can also review how to review a garment sample or discuss prototype development with Jiajia Apparel.