A tech pack—short for technical packet—is the absolute blueprint of your garment. Think of it as the architectural rendering for a house; without it, builders are just guessing where the walls go. In the fashion industry, this comprehensive document bridges the gap between your creative vision and a custom clothing manufacturer.

If you are transitioning from sketch to physical product, understanding this document is the single best way to protect your financial investment, ensure design accuracy, and streamline the sampling process explained by major production houses.

Here is exactly how to build a production-ready tech pack that converts your creative ideas into flawlessly executed apparel.

1. The Cover Page and Design Snapshot

Your cover page serves as the executive summary of your garment. It should give a factory manager or pattern maker an immediate understanding of the project scope.

• Flat Sketches (Technical Drawings): Include clean, black-and-white vector sketches of the front, back, and any complex side profiles. Do not include artistic fashion illustrations; factories need exact geometric representations.

• Core Metadata: Clearly display your brand name, style number, collection name, date of creation, and version history. Track revisions diligently—if you modify a pocket placement during sampling, update the version number (e.g., v1.1 to v1.2) to ensure the factory floor works off the latest iteration.

by Michael Myers (https://unsplash.com/@myers2021)

2. The Bill of Materials (BOM)

The Bill of Materials is a master checklist of every single physical item required to construct the finished garment. Missing a single item here can stall your production line for weeks while sourcing replacements.

Your BOM must detail the following components:

• Primary Shell Fabrics: Specify fiber content (e.g., 95% Organic Cotton, 5% Elastane), fabric weight in GSM (Grams per Square Meter), and weave type.

• Secondary Fabrics: Linings, pocket bags, and ribbing.

• Hardware and Closures: Zippers (specify brand like YKK, gauge size, and lock type), buttons, snaps, and rivets.

• Thread and Notions: Thread type, weight, and specific color codes.

• Labels and Packaging: Main neck labels, care/content tags, hangtags, and polybags.

For every material listed, explicitly provide the vendor name, supplier item code, and a physical color standard—preferably using the Pantone Fashion, Home + Interiors (FHI) system to eliminate visual ambiguity.

3. The Measurement Specification and Size Grading Chart

This is arguably the most technical portion of your packet. It dictates the fit, drape, and sizing architecture of your collection. Start by establishing your base size (often a Medium or Size 6) and map out the Points of Measurement (POM).

+------------------------------+---------------+---------------+---------------+

| Point of Measurement (POM)   | Size S (Tol.) | Size M (Base) | Size L (Tol.) |

+------------------------------+---------------+---------------+---------------+

| Across Chest (1" below arm)  | 19.5" (+/-¼") | 20.5" (+/-¼") | 21.5" (+/-¼") |

| Body Length (HPS to hem)     | 27.0" (+/-½") | 28.0" (+/-½") | 29.0" (+/-½") |

| Sleeve Length (from shoulder)| 24.5" (+/-¼") | 25.0" (+/-¼") | 25.5" (+/-¼") |

+------------------------------+---------------+---------------+---------------+

Beside each measurement, you must include a tolerance allowance. A tolerance is the acceptable margin of error (e.g., +/- 0.25 inches) that a garment can deviate from the tech pack during production before it is deemed defective. Outline your grade rules clearly so the manufacturer knows exactly how many fractions of an inch to add or subtract as they scale the garment up to an XL or down to an XS.

4. Component Construction and Stitching Specifications

You cannot simply tell a factory to "sew the side seam." You must tell them exactly how to sew it. Different stitches offer entirely different structural properties, stretch capacities, and aesthetic finishes.

Utilize standard ASTM International or ISO stitch classifications to guide your cut and sew manufacturing partners:

• Seam Types: Specify flatlock seams for activewear to reduce chafing, French seams for luxury silk blouses, or overlock (serged) seams for standard knitwear.

• Stitched Details: Define the Stitches Per Inch (SPI). A standard t-shirt might use 10–12 SPI, while high-durability performance gear or heavy denim requires higher density.

• Reinforcements: Indicate where bar tacks are required to prevent tearing, such as at pocket openings or belt loops.

Annotate these details using callout graphics directly on your technical sketches, pointing directly to the seam in question.

5. Brand Artwork, Prints, and Placements

If your design includes screen prints, embroideries, sublimated graphics, or custom woven patches, they require dedicated real estate within your documentation.

• Artwork Scales: Provide the artwork at a 1:1 scale in a vector format (such as AI or EPS files).

• Application Method: State whether the graphic is a plastisol screen print, water-based print, high-density print, or direct-to-garment (DTG) embroidery.

• Positioning Coordinates: Never say "center of the chest." State: "Centered horizontally, exactly 3.5 inches down from the High Point Shoulder (HPS) seam."

by Vitaly Gariev (https://unsplash.com/@silverkblack)

6. Navigating the Sampling Flow

Once your documentation leaves your hands, the physical validation phase begins. A professional production workflow follows a strict cycle of prototyping to catch construction errors before bulk machinery turns on:

1. Proto Sample (Fit 1): Built using your initial design documents. The factory will often use available substitute fabrics (in-market fabric) just to test the silhouette and pattern accuracy.

2. Size Set Samples: Prototypes built across your entire size spectrum to verify that your mathematical grading rules translate comfortably to human bodies of different proportions.

3. Pre-Production Sample (PP Sample): The holy grail sample. This is sewn using the actual production fabric, correct trims, final labels, and exact machinery lines. Once you sign off on the PP sample, the factory uses it as the quality standard for the entire bulk run.

Final Thoughts

Investing time into creating flawless technical documentation saves thousands of dollars in wasted fabric, shipping delays, and manufacturing disputes. By explicitly laying out your materials, tolerances, and stitching requirements, you provide your production partners with a clear roadmap to success.

Get in touch with Springtex today to learn more about our end-to-end clothing manufacturing solutions.