Pattern Drafting

7. Pattern grading

Pattern grading is the process of increasing or decreasing a base pattern to create different sizes while maintaining the garment’s original style, proportions, and fit. It is an essential technique in garment production, especially in ready-to-wear and mass manufacturing.

Importance of Pattern Grading

Produces garments in multiple sizes (e.g., S, M, L, XL)

Maintains consistent design proportions

Saves time in production

Ensures size standardization in the fashion industry

Basic Principles of Pattern Grading

Use a Base Size (Master Pattern)

Grading begins with a well-fitting base pattern, usually in a medium or standard size.

Apply Grade Rules

Grade rules are specific measurements added or reduced at key points such as:

Bust

Waist

Hip

Shoulder

Armhole

Maintain Proportions

Adjustments must be evenly distributed to maintain garment balance and shape.

Methods of Pattern Grading

1. Manual Grading

Done using rulers and grading increments on paper.

Involves marking measurement increases or decreases at specific points.

Common in small-scale production and learning institutions.

2. Pattern Shifting Method

The pattern is moved horizontally and vertically by specific increments.

Ensures even enlargement or reduction.

3. Computer-Aided Grading (CAD)

Uses specialized pattern-making software.

Common in industrial and large-scale production.

Ensures high accuracy and efficiency.

Grading Increments

Grading increments vary depending on size charts. For example:

Bust may increase by 2–4 cm per size.

Waist may increase by 2–3 cm per size.

Hip may increase by 2–4 cm per size.

These increments must follow standard size specifications.

Guidelines for Accurate Grading

Start with an accurate master pattern.

Follow standard size charts.

Apply increments consistently at all grading points.

Re-check balance and seam lengths after grading.