Size Chart Tool for Pattern Grading and Fit Specification Sheets

Grading & Fit Documentation

Pattern grading and fit specifications work together. The size chart defines measurement targets; grading translates these to pattern adjustments; fit specs document the requirements for sampling and production.

Accurate pattern grading starts with accurate size specifications. Fit specification sheets document these requirements for the entire product development and production process. Professional size chart tools provide both—the data for grading and the documentation for fit approval.

Fit Specification Sheet Components

Measurement Table

• All POMs with codes
• Measurements by size
• Tolerance columns (+/-)
• Critical POM flags

Measurement Diagram

• Flat sketch/technical drawing
• Numbered callouts
• Measurement arrows
• Reference points

Grading Information

• Grade increments
• Base size notation
• Break point notes
• Jump grade indicators

Fit Notes

• Silhouette description
• Fit model notes
• Special instructions
• Revision history

Pattern Grading Process

Size Chart Specification

Complete size chart defines measurements for all sizes in the range with grade increments visible.

Grade Rule Derivation

Graders translate spec increments to X/Y movements at pattern grading points.

Rule Application

Grade rules applied to base pattern generates full size nest automatically.

Verification

Graded patterns verified against spec to confirm finished garments will meet targets.

Grade Increment Example

POM	XS	S	M	L	XL	Grade
Chest (1/2)	17"	18"	19"	20"	21"	1"
Waist (1/2)	15"	16"	17"	18"	19"	1"
Body Length	26"	27"	28"	29"	30"	1"
Shoulder	15"	15.5"	16"	16.5"	17"	0.5"

Base Size: M (highlighted)

Grade rules applied in both directions from base. Small sizes grade down, large sizes grade up using the same increment values.

Production QC Integration

Inline QC

Critical POMs during sewing

End-Line

All measurements checked

Final Audit

AQL sampling verification

Professional Grading Specs

Complete fit specifications and grading documentation for pattern development and production.

Start Grading Specs

Frequently Asked Questions

What is a fit specification sheet?

A fit specification sheet documents all measurements, tolerances, and fit requirements for a garment style. It serves as the reference for sampling, production, and quality control—the definitive source for how the finished garment should measure at each POM.

How do grade rules work in pattern grading?

Grade rules define the X and Y axis movements at each grading point on a pattern to scale between sizes. These increments are derived from size chart specifications. For example, a 2-inch chest increase might distribute as 0.5 inch at each of four grading points around the armhole and side seam.

What measurements are critical for fit specs?

Critical fit measurements vary by garment type but typically include chest/bust circumference, waist, hip, shoulder width, sleeve length, and body length. These POMs are designated as 'critical' with tighter tolerances because they most directly impact how the garment fits the body.

Can size chart tools generate grading increments?

Yes, professional size chart tools automatically calculate and display grading increments from the measurement specifications. When you define measurements for each size, the tool shows the grade between sizes, which pattern makers and graders use to set up grade rules in their CAD systems.

How are fit specs used in production?

Fit specs serve as the QC reference throughout production. Inline inspectors measure garments against spec tolerances during sewing, end-line QC checks all measurements before packing, and final audit verifies random samples against the complete fit specification before shipment.