How Pattern Grading Works

350. Pattern grading is the process of creating a range of garment sizes from an approved base pattern. Once the original sample size has been fitted and approved, the pattern is increased or decreased proportionately to create additional sizes.

The aim of grading is to maintain the fit, balance, style and proportions of the original garment throughout the entire size range.

Although grading may appear straightforward, it requires a strong understanding of body proportions, garment balance and pattern construction.

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What Is A Grade Rule?

A grade rule is the amount that a specific point on a pattern moves between sizes.

Different areas of the garment are graded by different amounts depending on:

garment type
fit
target customer
age group
manufacturing requirements

For example:

chest measurements
waist measurements
armholes
sleeve widths
rises
shoulder widths

may all require different grading increments.

Manual Pattern Grading

Traditionally, pattern grading was carried out entirely by hand.

The grader would mark out each size individually using grading rules and then trace or cut the new sizes manually.

This process required:

precision
consistency
an understanding of garment proportions
practical pattern cutting experience

Manual grading is still used today for:

bespoke garments
small production runs
specialist pattern cutting

card patterns

Stack Grading

Before computer grading became common, some experienced graders used a process known as stack grading.

This involved stacking multiple sheets of card together and cutting several sizes at the same time using long-handled shears.

Stack grading was much faster than grading each size individually, but it required considerable skill and accuracy. If the grading was incorrect, every size in the stack would also be incorrect.

all require different grading increments.

Digital Pattern Grading

Today most grading is carried out digitally using computer grading software.

The pattern is digitised into the computer, and grade rules are applied electronically to create the additional sizes.

Digital grading offers several advantages:

faster production
easier amendments
file storage
factory compatibility
overseas file transfer

However, successful grading still depends heavily on the quality of the original pattern and the grading rules being used.

Why Size Charts Matter

A good size chart is one of the most important parts of successful grading.

The size chart controls:

garment measurements
body measurements
grading increments
overall fit consistency

Without a proper specification, factories may apply grading inconsistently or use unsuitable grading increments.

This is particularly important for:

childrenswear
plus sizes
tailoring
technical garments

Grading Is A Compromise

Pattern grading is not an exact science.

Human bodies do not increase proportionately in every area as sizes become larger or smaller.

For example:

shoulders
armholes
biceps
waist proportions

may all change differently between sizes.

This means grading systems often involve compromise, especially across very large size ranges.

The wider the size range becomes, the more important it is to control proportions carefully.

Menswear Grading

Menswear grading can become quite complex because mens garments often involve:

multiple chest sizes
short, regular and long fittings
different fit blocks
varying waist proportions

Traditional tailoring may include:

slim fit
regular fit
athletic fit
corpulent fit

Each fit type may require different grading considerations.

Womenswear Grading

Standard womenswear grading is often relatively straightforward across smaller size ranges.

However, grading becomes more difficult:

outside standard size ranges
in plus sizes
with fitted garments
with structured garments

As sizes increase, the relationship between areas such as the armhole, shoulder and bust becomes increasingly important.

Childrenswear Grading

Childrenswear grading is often more complicated than adult grading because children change:

height
proportions
posture
body shape

very rapidly as they grow.

This means childrenswear grade rules require more careful adjustment across the size range. Learn more about how to grade Childrenswear patterns.

Manual Vs Digital Grading

Both manual and digital grading have advantages.

Manual Grading

Best for:

simple grading
small size ranges
bespoke work
pattern cutters working directly from card

Digital Grading

Best for:

larger production runs
factory production
offshore manufacturing
multiple sizes
efficient file management

In practice, the most successful grading usually combines practical pattern cutting knowledge with modern digital systems.

Can You Grade Patterns Yourself?

Simple grading can often be learned reasonably quickly, especially for uncomplicated garments and small size ranges.

However, more specialised grading such as:

tailoring
childrenswear
plus sizes
technical garments

requires considerably more experience and understanding of garment proportions.

One of the most important parts of grading is checking the finished sizes carefully throughout the process. If you would like to learn how to grade we provide 1-1 pattern grading tuition in London.

If you would prefer tolerant pattern grading from the comfort of your own home with remote learning, we also off

online pattern grading tuition

Learn More About Professional Pattern Grading

If you require professional pattern grading services for menswear, womenswear, childrenswear or plus sizes, please contact us or visit our Pattern Grading Services page for further information.

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