How To Create a Tech Pack To Send To Manufacturers

Every clothing line starts with an idea, but turning creative inspiration into physical garments requires structured documentation. A tech pack—short for technical package—translates visual design details into exact specifications that any factory in the world can execute. Without one, suppliers fill in missing data using assumptions, leading to incorrect samples, bloated production costs, and launch delays.

According to a report synthesized by Capital One Shopping Research, sizing, fit, and color issues drive 45% of all retail returns, with 26% of US consumers sending back online clothing purchases. Skimping on technical documentation or relying on vague notes leads to pattern errors and inconsistent fit across production runs, triggering costly return cycles.

Learn how to create a tech pack, which materials and measurements to include, how to evaluate the first-fit sample, and how tech pack data feeds into your Shopify store structure.

What is a tech pack?

A tech pack is an informational master document that details every physical component and construction requirement for a garment. It acts as the single source of truth for your fashion brand, designer, pattern maker, and manufacturer throughout the development lifecycle—from planning and sampling to production.

A professional tech pack outlines exact dimensions, seam allowances, fabric type choices, hardware specifications, and artwork placements. It serves as an essential operational contract that holds your factory accountable to strict quality benchmarks.

Establishing this central blueprint early helps protect your profit margins, prevent miscommunication across overseas supply chains, and ensure your finished goods match your original version.

Why tech packs matter in apparel production

Building a comprehensive spec sheet changes how your brand interacts with manufacturing partners. Standardizing your specification process delivers two things every growing apparel enterprise needs: predictable quality and operational control. Here’s why: 

Accurate material and labor costs 

A clear bill of materials and exact usage estimates allow you to calculate unit costs before placing a bulk purchase order. When suppliers receive complete specs, they quote accurate labor and material costs rather than adding cost buffers to account for unknown variables. Preventing unnecessary revision runs preserves your cash flow and keeps your clothing line on budget.

Misunderstandings over garment construction also slow down production, which can rack up expenses. When a factory receives incomplete sketches, workers must stop and ask questions or guess your intent, which can lead to rejected garments. Detailed technical drawings and clear point callouts eliminate this back-and-forth, letting your vendor produce an accurate first sample.

Product consistency

Inconsistent sizing damages customer trust and spikes return rates for products sold online. A tech pack establishes strict tolerance limits for every measurement across your entire size run. Adhering to these documented targets ensures that every batch produced matches the approved fit sample, preserving your brand reputation across multiple factory runs.

Treat technical documentation as step zero when building a cohesive product collection. Standardizing base measurements, trim hardware, and fabric formulations across multiple styles lets you aggregate material orders across several garments. Reusing proven block patterns across a full collection lowers pattern-making fees, reduces sample timelines, and establishes consistent sizing across your entire brand.

How to create a tech pack

1. Gather reference pictures and preliminary concepts
2. Draft vector flat sketches and technical drawings
3. Construct the bill of materials
4. Define points of measure and grade rules
5. Detail construction methods, label placement, and artwork
6. Evaluate the first fit sample and manage revision logs
7. Use tech pack information as the starting point for product listings

Here’s how to create a tech pack for garments: 

1. Gather reference pictures and preliminary concepts

Begin by assembling visual references that capture your intended style, silhouette, and construction. Collect high-resolution pictures, vintage garment reference photos, and fabric swatches that represent the desired drape and hand-feel.

Use these reference assets to determine baseline dimensions, seam placements, and functional elements. Rather than relying on high-level mood boards, isolate specific technical elements—such as a pocket flap shape, topstitching weight, or heavy-duty zipper closure—so your vendor understands your exact structural expectations.

2. Draft vector flat sketches and technical drawings

Create two-dimensional, black-and-white flat sketches using vector software like Adobe Illustrator. Unlike artistic fashion illustrations, technical drawings depict garments laid completely flat, showing clean construction lines without human posing, shading, or stylized rendering.

Render both front and back views of the item. Add detailed inset views or zoomed-in image callouts for complex features like hidden interior pockets, specialized lining attachments, or custom seam tape. Annotate every drawing with clear pointer lines indicating exact stitch locations, seam types, and hardware coordinates. 

Export high-resolution PDF files or vector formats so factory technicians can zoom in on fine details without losing line clarity.

3. Construct the bill of materials 

The bill of materials (BOM) is an exhaustive inventory listing every raw material, trim, and packaging component required to create a finished garment. Omitting a single item like thread specification or internal interfacing can cause factory delays.

Organize your BOM table into distinct columns:

• Fabric. Specify the main fabric type, fiber composition, weight (GSM or ounces per square yard), weave, and mill source.

• Secondary materials. This includes document lining, pocketing, ribbing, and fusible interfacings.

• Trims and hardware. List buttons, zippers, drawstrings, eyelets, and snaps, including metal finishes and sizing.

• Threads. Define thread weight, fiber content, and stitch density targets.

• Labels and packaging. Detail brand woven tags, care labels, hangtags, polybags, and shipping packaging.

Assign a specific color name and standardized Pantone system code to every listed item. Never assume a vendor will match “navy” or “olive” without an explicit Pantone reference number. Here’s an example of a bill of materials:

4. Define points of measure and grade rules

A measurement chart dictates the exact physical dimensions for your garment in each size you plan on selling. Establish your base specs first, like a medium for adult collections, by measuring a physical prototype or an existing benchmark garment.

Identify key point-of-measure callouts, including:

• Total body length from high point shoulder (HPS)

• Chest width measured flat across the armhole seam

• Sweep width along the bottom opening

• Sleeve length from center back neck to cuff edge

• Neck drop, collar height, and shoulder slope angle

Once you finalize base measurements, establish grade rules. Grade rules determine how much each measurement expands or contracts as sizes scale up or down (e.g., adding two inches to chest circumference per size increment from small through XL). Calibrated grading keeps proportional balance intact, preventing ill-fitting garments in extreme size ranges.

5. Detail construction methods, label placement, and artwork

Document how factory operators must assemble each panel. Specify stitch types using ISO standards (e.g., ISO 401 chainstitch, ISO 605 flatlock seam), stitches per inch (SPI), and seam allowance tolerances (e.g., 1/2-inch standard seam allowances).

Include explicit visual guides showing the location of graphic print or embroidery artwork. Define distance coordinates from key structural seams, such as positioning a chest screen print three inches below the front neck seam and centered horizontally. 

Specify care label positions, fold styles, and country-of-origin tag placements.

6. Evaluate the first fit sample and manage revision logs

Send your finalized document to your vendor to request a first fit sample. When the physical prototype arrives, lay it on a flat table and measure every single BOM against your target specification chart.

Record measurement variances inside a dedicated revision log within your master file. If the sample’s chest width measures 1.5 centimeters too small, note the deviation, photograph the fit defect on a mannequin or model, and issue updated instructions to the factory. Maintain clear revision numbers (e.g., Version 1.0, Version 1.1), so both your internal team and external partners always work from the current file.

7. Use tech pack information as the starting point for product listings

Once you’re satisfied with the samples and have placed your order with the manufacturer, you can add the product to your online store. 

Use finished product data from your tech pack (including fabric type, color, and fit profile) to fill out category metafields for apparel in your Shopify store back end. Capturing these data points during the tech pack–creation process saves time when building your store catalog.