How to Create a Tech Pack for Clothing Manufacturing: Complete Guide

A tech pack is the blueprint of your garment. It tells your factory exactly what to make, how to make it, and what materials to use. A good tech pack eliminates 90% of production errors. A bad tech pack guarantees re-sampling, delays, and cost overruns.

After reviewing thousands of tech packs from brands of all sizes, we've identified the 9 components that separate professional tech packs from amateur ones. Here's exactly what to include.

Why Tech Packs Matter

Without a tech pack, your factory is guessing. They'll make reasonable assumptions that may not match your vision. Every assumption is a risk:

• Wrong fabric weight — Your "lightweight cotton" becomes a heavyweight canvas.
• Wrong measurements — Your size M fits like a size S.
• Wrong construction — Your "flat-felled seam" becomes a regular overlock seam.
• Wrong finish — Your "matte" buttons become glossy.

A tech pack costs $0 to make (you can do it yourself) but saves $500-$5,000 in re-sampling and production errors. It's the highest-ROI document in clothing manufacturing.

The 9 Essential Components of a Professional Tech Pack

1. Technical Flat Sketches (Front & Back)

Include flat, black-and-white line drawings of the garment from front and back. These are not fashion illustrations — they're technical drawings that show:

• Overall silhouette and proportions
• Seam lines and stitching locations
• Button, zipper, and closure positions
• Pocket placement and style
• Hemline shape and length

Include callouts — numbered annotations pointing to specific construction details (e.g., "1: Coverstitch hem, 3/8 inch", "2: Centered zipper, 7 inch").

2. Bill of Materials (BOM)

The BOM is the complete list of every material that goes into your garment. A missing component means the factory substitutes their own — which is rarely what you want.

3. Measurement Spec Sheet (Size Chart)

This is the most critical document in your tech pack. It defines the exact measurements for each size. A single centimeter off can make a garment unwearable.

Include these measurements for each size (XS through 2XL at minimum):

Always provide measurements in centimeters — Chinese factories work in metric. If you provide inches, they'll convert, and rounding errors creep in.

4. Grade Rules (Size Grading)

Grade rules define how much each measurement changes between sizes. Without grade rules, your factory will guess — and they'll guess wrong.

Standard grade rules for women's apparel (the difference between each size):

These are starting points, not absolute rules. Adjust based on your fit model and target customer body type.

5. Construction Details

Specify exactly how each part of the garment should be constructed. Don't assume the factory knows what you want.

• Seam types: "Flat-felled seam on side seams", "French seam on armhole", "Overlock 4-thread on all raw edges"
• Stitch density: "12-14 SPI (stitches per inch)" for regular seams, "8-10 SPI" for topstitching
• Hem: "Double-fold blind stitch hem, 3/4 inch", "Coverstitch, 3/8 inch, 2-needle"
• Edge finishing: "All raw edges serged/overlocked", "Bias binding on neckline"
• Reinforcement: "Bar tack at pocket corners", "Reinforcement tape at shoulder seams"

6. Color and Print Specifications

Color miscommunication is a top-3 production error. Here's how to avoid it:

• Provide Pantone TCX numbers — Not TPX (paper) or "C" (coated). TCX (Textile Cotton) is the standard for fabric. Your factory can match to TCX precisely.
• Send physical fabric swatches — Even with Pantone numbers, send a physical reference. Pantone colors look different on screen, on paper, and on fabric.
• Specify color matching tolerance — Acceptable deviation is Delta E ≤ 2.0 (professional standard). If you don't specify, factories aim for "visually similar" which is subjective.
• For prints: Provide the digital file at 300 DPI, actual size, in the colorway you want. Include a color-separated file if possible.

7. Labeling and Packaging

Specify every label and tag that goes on your garment:

• Brand/neck label: Size, material (woven damask, printed satin, cotton twill), placement (center back neck, sewn-in or heat-cut)
• Size label: Separate or combined with brand label, placement
• Care label: Content, format (printed or woven), language(s), placement (side seam)
• Country of origin label: Required by law — "Made in China"
• Hangtag: Design, size, material, attachment method (string, plastic hook)
• Poly bag: Recycled PE, size, closure (adhesive strip, zipper), individual or bulk packing

8. Quality Requirements

Define what "acceptable" quality looks like:

• Seam strength: Minimum 15 lbs per inch for regular seams, 25 lbs for stress seams (crotch, armhole)
• Seam allowance: Specify for each seam (typically 3/8" or 5/8")
• Stitch count: SPI for each seam type
• AQL standard: Specify Acceptable Quality Level (industry standard: AQL 2.5 for major defects, AQL 4.0 for minor)
• Label placement accuracy: ±2mm from specified position
• Cleanliness: No oil stains, no loose threads, no needle marks on face of garment

9. Sample Approval & Revision History

Track every revision with version numbers and dates:

Only the latest approved version should be used for production. Many production errors happen because the factory used an old version of the tech pack.

Tech Pack Tools and Software

• TechPacker — Cloud-based, purpose-built for tech packs. Free plan available. Best for beginners.
• Adobe Illustrator + templates — Industry standard. More flexible but requires AI skills.
• Google Sheets/Excel — Works for simple garments. Not ideal but better than nothing.
• Canva — Not recommended for tech packs. Lacks the precision needed for spec sheets.

Common Tech Pack Mistakes

Mistake 1: Missing Tolerances

Every measurement needs a tolerance (±X cm). Without it, a garment that's 2cm too small is technically "in spec" — but unwearable. Always specify tolerance for every measurement.

Mistake 2: Ambiguous Fabric Descriptions

"Cotton blend" means nothing. "65% cotton, 35% polyester, 180 GSM, 58/60" width, reactive dyed" is a real spec. Be specific.

Mistake 3: No Construction Diagrams

Words alone are ambiguous. A simple sketch of how a seam should look (e.g., showing the fold direction for a flat-felled seam) eliminates confusion.

Mistake 4: Not Specifying Thread

Thread type matters. Polyester thread on cotton garments causes puckering after washing. Cotton thread on stretch fabrics breaks at the seam. Always specify thread type and tex size.

Mistake 5: Copying Another Brand's Tech Pack

Every brand's fit is different. What works for Zara won't work for your brand. Develop your own grade rules based on your fit model and customer body type.

Conclusion

A professional tech pack is the difference between "the factory got it right the first time" and "we needed 3 rounds of re-sampling." Invest 2-4 hours in creating a thorough tech pack, and you'll save weeks of production time and hundreds of dollars in sample costs.

At Essty Garment, we help brands create tech packs from scratch — send us your design sketches or reference images, and we'll build a complete tech pack for you within 48 hours. Free for orders of 100+ pieces.