Grading

The Grading Process

Grading involves calculating the measurement difference between consecutive sizes at each construction point — bust, waist, hip, shoulder, sleeve length, etc. A typical womenswear grade rule might add 1 inch at bust and hip and 0.75 inches at waist between sizes. These increments are applied systematically across the pattern, with each piece adjusted proportionally to maintain fit relationships. The process requires understanding of body proportions, construction engineering, and the garment’s intended fit character.

Grading Challenges in Fashion

Grading is deceptively complex because human bodies do not scale proportionally. A size 2 body has different proportions than a size 14 — torso length, arm circumference, and back width increase at different rates. Sophisticated grading systems use multiple grade tables and may apply non-linear increments that reflect actual body proportion changes. Simply scaling a pattern proportionally across sizes produces garments that fit poorly at the extremes.

Inclusive Sizing and Grading

The push for inclusive size ranges (extending to 3X, 4X, and beyond) has highlighted grading limitations. Extended sizes cannot simply extrapolate existing grade rules — they require dedicated fit models, body-shape-specific pattern adjustments, and sometimes complete pattern re-engineering. Brands committed to genuine size inclusivity invest in extended-size grading expertise and fit testing across the full size range.

OSF Perspective

OSF recognizes grading as a technical discipline with profound implications for fashion inclusivity and customer satisfaction. The brands that invest in sophisticated grading — particularly across extended size ranges — demonstrate commitment to serving diverse bodies, not merely claiming to through marketing.

Related Terms

Pattern Making  |  Tech Pack  |  Bill of Materials  |  Quality Control

Notable Brands

Gerber Technology, Optitex, Browzwear, Universal Standard (inclusive grading)