Tech Pack vs Spec Sheet: Which One Do You Need?
When you are developing a garment, you may come across terms like tech pack, spec sheet, measurement sheet, and technical package. For someone new to clothing manufacturing, these terms can sound confusing.
A common question is: What is the difference between a tech pack and a spec sheet?
Although both documents are used during garment development, they do not serve exactly the same purpose. A spec sheet mainly focuses on garment measurements and sizing, while a tech pack contains broader technical information needed to develop and manufacture a garment.
Understanding this difference can help fashion brands communicate better with pattern makers, sample rooms, and manufacturers.
What Is a Tech Pack?
A tech pack, short for technical package, is a document that explains how a garment should be developed and manufactured.
It turns a design idea into clear technical instructions that a manufacturer can follow.
Depending on the garment and brand, a tech pack may include:
- Technical flat sketches
- Garment measurements
- Fabric details
- Colors
- Trims and accessories
- Construction details
- Stitching information
- Artwork and embroidery placement
- Labels and branding
- Packaging instructions
- Bill of Materials (BOM)
- Measurement tolerances
The main purpose of a tech pack is to keep important production information in one place.
If you want to understand how a tech pack can help avoid manufacturing problems, read our guide on Clothing Tech Pack: How It Reduces Production Errors.
What Is a Spec Sheet?
A spec sheet, or specification sheet, mainly focuses on the measurements of a garment.
It tells the pattern maker, manufacturer, and quality control team what the finished garment measurements should be.
For example, a T-shirt spec sheet may include:
- Body length
- Chest width
- Shoulder width
- Sleeve length
- Sleeve opening
- Neck width
- Front neck drop
- Back neck drop
- Bottom opening
- Pocket dimensions
A spec sheet can also include Points of Measure (POMs) and measurement tolerances.
For example:
Body Length – Size M: 70 cm ± 1 cm
This tells the production team that the target body length is 70 cm, with an allowed variation of 1 cm according to the brand’s tolerance.
Tech Pack vs Spec Sheet: What’s the Difference?
The easiest way to understand the difference is:
A spec sheet focuses mainly on garment measurements, while a tech pack covers the wider technical requirements of a garment.
A spec sheet can also be included as part of a larger tech pack.
However, the exact format can vary from one clothing brand or manufacturer to another.
A Tech Pack May Include:
- Design details
- Technical sketches
- Measurements
- Fabric information
- Trims
- Construction details
- Stitching details
- Artwork
- Labels
- Packaging
- BOM
- Sample comments
A Spec Sheet Mainly Includes:
- Points of Measure
- Finished garment measurements
- Size specifications
- Measurement tolerances
- Grade rules
- Measurement instructions
In simple terms:
Tech Pack = Complete Technical Production Information
Spec Sheet = Garment Measurement Information
Is a Spec Sheet Part of a Tech Pack?
In many apparel development processes, yes.
A spec sheet can be one section of a complete tech pack. However, some brands and manufacturers keep their spec sheets as separate documents.
There is no single format that every clothing company must follow.
The important thing is that the manufacturer receives clear, accurate, and updated information.
You can also read StartUp FASHION’s guide to Tech Packs and Spec Sheets for another explanation of how these documents are used in fashion product development.
What Does a Tech Pack Include?
The contents of a tech pack depend on the garment and the production requirements.
Technical Flat Sketch
A technical flat shows the garment in a simple, detailed view, usually from the front and back.
It helps communicate design and construction details more clearly than a fashion illustration.
Measurement Information
A tech pack can include the required measurements for different sizes.
These measurements help the manufacturer understand the intended fit and proportions of the garment.
Fabric Details
Fabric information may include:
- Fabric name
- Composition
- GSM
- Color
- Finish
- Fabric construction
Fabric selection can affect the garment’s appearance, fit, weight, and performance.
If you are also working on garment costing, read our guide on How to Calculate Fabric Cost for Clothing Manufacturing.
Bill of Materials
The Bill of Materials (BOM) lists the materials required to make the garment.
Depending on the product, it may include:
- Main fabric
- Rib
- Buttons
- Zippers
- Labels
- Thread
- Elastic
- Drawcords
- Eyelets
- Packaging materials
Construction Details
Construction information explains how the garment should be assembled.
It may cover:
- Seam types
- Stitch types
- Seam allowance
- Hem finishing
- Collar construction
- Cuff construction
- Pocket construction
- Zipper details
- Topstitching
Artwork and Branding
If the garment includes embroidery, printing, patches, or a logo, the tech pack can specify its:
- Placement
- Size
- Color
- Dimensions
This helps ensure the branding appears consistently across production.
What Does a Spec Sheet Include?
A spec sheet is more focused on the actual dimensions of the finished garment.
Points of Measure
Points of Measure, or POMs, identify exactly where measurements should be taken.
For example:
- Chest width
- Body length
- Shoulder width
- Sleeve length
- Neck width
- Bottom opening
- Armhole
Clear POMs are important because different people may otherwise measure the garment differently.
Base Size
A base size is the main size used as the reference for developing the other sizes.
For example, a brand may use Size M as its base size.
Size Measurements
A spec sheet can show measurements for multiple sizes, such as:
S → M → L → XL
Each size will have its own required measurements.
Measurement Tolerances
Tolerance defines the acceptable difference between the target measurement and the actual garment measurement.
For example:
Chest Width: 52 cm ± 1 cm
This gives the quality control team a clear measurement range to follow.
Grade Rules
Grade rules explain how measurements change between sizes.
They help the pattern maker create different sizes while maintaining the intended fit and proportions.
Why Is a Spec Sheet Important?
A garment can look correct but still have incorrect measurements.
For example, a T-shirt may look similar to the approved sample but have a:
- Longer body
- Wider chest
- Shorter sleeve
- Larger neckline
- Wider bottom opening
These differences can affect the final fit.
A spec sheet gives the production and quality control teams measurable standards to follow.
It also makes it easier to identify where a problem may have occurred.
For example, incorrect measurements could be caused by:
- An incorrect pattern
- Cutting variation
- Sewing variation
- Incorrect grading
- An outdated specification
- Incorrect size labeling
Why Is a Tech Pack Important?
A tech pack provides a much wider production reference.
Without a proper tech pack, manufacturers may have to depend on sketches, emails, messages, verbal instructions, or sample garments.
This can lead to misunderstandings.
For example, a design may show a pocket, but the manufacturer may not know:
- How large the pocket should be
- Exactly where it should be placed
- What fabric should be used
- What stitching should be used
- How far it should be from the side seam
A detailed tech pack can document these requirements clearly.
This becomes especially useful when a brand works with an external or overseas manufacturer.
Tech Pack vs Spec Sheet: Which One Do You Need?
For most professional garment development processes, both can be useful.
They simply perform different jobs.
A spec sheet is especially useful for controlling:
- Measurements
- Fit
- Sizing
- Tolerances
- Grading
A tech pack is useful for managing:
- Design details
- Measurements
- Fabric
- Trims
- Construction
- Artwork
- Labels
- Packaging
- Production requirements
So instead of thinking of them as competing documents, it is better to think of them as two connected parts of the garment development process.
How Do Tech Packs and Spec Sheets Work Together?
A typical garment development process can look like this:
Design Concept
↓
Pattern Development
↓
Tech Pack + Spec Sheet
↓
First Sample
↓
Fit & Measurement Review
↓
Corrections
↓
Approved Sample
↓
Grading
↓
Bulk Production
The pattern creates the pieces needed to cut the garment.
The spec sheet defines the required finished measurements.
The tech pack communicates the wider technical and production requirements.
For more information about how patterns are developed, read our guide on Garment Pattern Making: A Beginner’s Guide.
Tech Pack, Spec Sheet, and Pattern: What’s the Difference?
These three terms are often confused, but they have different roles.
Pattern
A pattern is the template used to cut fabric into individual garment pieces.
It may include pieces such as:
- Front
- Back
- Sleeve
- Collar
- Cuff
- Hood
- Waistband
Spec Sheet
A spec sheet defines the required measurements of the finished garment.
Tech Pack
A tech pack contains the wider technical information required to develop and manufacture the garment.
A simple way to remember the difference is:
Pattern → What to Cut
Spec Sheet → What Measurements the Garment Should Have
Tech Pack → How the Garment Should Be Developed and Manufactured
Common Mistakes With Tech Packs and Spec Sheets
Even when brands use technical documents, mistakes can happen if the information is incomplete or outdated.
Using an Old Spec Sheet
If measurements were changed during sampling but the old spec sheet is still being used, the manufacturer may produce the wrong version.
Not Updating the Tech Pack
Whenever important product details change, the tech pack should also be updated.
Missing Tolerances
Without clear tolerances, the quality control team may not know what measurement variation is acceptable.
Inconsistent Measurements
Measurements in the tech pack, spec sheet, pattern, and approved sample should match.
Unclear Points of Measure
If a POM is not clearly explained, different people may measure the same garment differently.
Relying Only on a Design Sketch
A fashion sketch communicates the visual idea, but it usually does not provide enough technical information for accurate production.
How to Keep Garment Documents Organized
A well-organized garment development system can make production much easier.
Depending on the product, your documentation may include:
- Approved design
- Technical flat
- Tech pack
- Spec sheet
- Pattern
- Grade rules
- BOM
- Sample comments
- Revision history
- Approved sample information
It is also important to make sure everyone is working from the latest version of the documents.
This becomes even more important when a brand is developing multiple styles, colors, or sizes at the same time.
Final Thoughts
A tech pack and spec sheet are closely connected, but they are not exactly the same thing.
A spec sheet mainly focuses on garment measurements, Points of Measure, tolerances, and size specifications. A tech pack covers a wider range of technical information, including measurements, fabric, construction, trims, artwork, labeling, and other production requirements.
For clothing brands, using these documents together can improve communication with pattern makers and manufacturers and help reduce avoidable production mistakes.
The most important thing is to keep the tech pack, spec sheet, pattern, approved sample, and production requirements consistent and updated.
When these documents work together, they provide a much stronger technical foundation for accurate and consistent garment manufacturing.
