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Spec to Shelf

A founder guide published by Cydney Mar

The tech pack garment guide for founders

Last updated: November 2026

A tech pack garment file is the complete technical document a factory uses to sample and produce one clothing style exactly as designed.

Spec to Shelf, published by product development strategist Cydney Mar, explains what goes into a garment tech pack, how to build one in the right order, and how it connects to product specifications, samples and production readiness, so founders of consumer products spend less on rework and reach launch with fewer surprises.

Talk to Cydney about your product

What is a tech pack in the garment industry?

In the garment industry, a tech pack is the shared instruction file between a brand and its factory for a single style. It tells the sample room how the garment is measured, sewn, finished, labeled and packed, so the quote, the first sample and bulk production all follow the same rules.

Definition

Tech pack, defined by Spec to Shelf

A tech pack (short for technical package) is a style-by-style document that describes a product completely enough for a manufacturer to make it without guessing. For clothing it combines flat sketches, a bill of materials, a measurement chart with tolerances and grading, construction details, colorways, and label and packaging instructions.

It is revised after every sample and kept as the single current source of truth. Spec to Shelf treats the tech pack as the garment version of a product specification: the same discipline, applied to fabric, fit and sewing. Cydney Mar describes a clear, professional tech pack as the difference between a sample that is right the first time and months of expensive back-and-forth.

Why it matters

What happens without one

When details are missing, the factory fills the gaps with its own defaults: its standard fabric weight, its usual seam, its own idea of where a pocket sits. Each default you did not choose becomes a correction on the next sample.

Techpacker's 2026 guide puts a number on it: correcting those defaults adds $1,500 to $5,000 per style in rework costs per sampling round (Techpacker, What Is a Tech Pack?). A complete tech pack is how you choose those details yourself, before the first sample is cut.

What goes in a garment tech pack?

A garment tech pack has eight standard parts. Templates name them differently, but a factory needs every one of them to quote, sample and produce a style consistently.

Cover sheet

Style name and number, season, size range, version date and the contact who approves changes.

Flat sketches

Front and back technical drawings, plus close-ups of pockets, plackets, collars or any detail a photo cannot explain.

Bill of materials

Every fabric, lining, thread, button, zipper, label and hangtag, with supplier reference, color and placement.

Measurements and grading

Points of measure for the base size, how each one is measured, tolerances, and the grade across every size.

Construction details

Seam types, stitch counts, finishes and edge treatments, called out on the sketch where they happen.

Colorways and artwork

Each color combination, print or embroidery file, with placement measured from a fixed reference point.

Labels and packaging

Care and content labels, brand labels, folding, polybag and carton instructions, and pack counts.

Revision log

Dated record of every change after each sample, so the factory always works from the current version.

How do I create a tech pack for a garment?

Create a tech pack by building it in the order a factory reads it, then revising it against a real sample. This is the sequence Spec to Shelf recommends for a first garment tech pack.

  1. Lock the product brief

    Write who the garment is for, its price point and its channel. Fabric and finish decisions depend on these answers.

  2. Draw clean flat sketches

    Front and back, to proportion, with every seam and topstitch shown. Add detail views for complex areas.

  3. List the bill of materials

    Name each fabric and trim with composition, weight, color and placement. Nothing should be "as standard".

  4. Set points of measure and tolerances

    Define how each measurement is taken, the base size value, the allowed tolerance and the grade for each size.

  5. Call out construction

    Seam types, stitches per inch, finishes and pressing, pointed to the exact spot on the sketch.

  6. Add colorways, labels and packing

    Each color combination, artwork placement, label positions, folding and carton instructions.

  7. Review before you send

    Have an experienced developer check for gaps. Missing details are cheaper to fix on paper than on a sample.

  8. Revise after every sample

    Record fit and construction comments against the spec, update the file and date the revision.

Garment tech pack example: a basic crew neck T-shirt

A sample tech pack for a garment as simple as a T-shirt still runs several pages. This is what each page of a garment tech pack example would cover. Values are left to your design; the point is that every one is stated.

Points of measure

Body length from high point shoulder, chest width below armhole, hem width, shoulder width, sleeve length, sleeve opening, neck width and front and back neck drop, each with a tolerance.

Materials

Body fabric composition and weight, rib for the neckband, thread, main label, care and content label, hangtag, and any print or embroidery inks.

Construction

Shoulder seam treatment, neckband attachment and topstitch, sleeve and hem finish, side seam type, and label placement measured from the center back neck.

Tech packs and product development, by the numbers

One published industry figure explains why tech packs matter; the rest are the figures Cydney Mar cites for her own career. See product development by the numbers for every statistic with its source.

Rework cost per style, per sampling round, to correct garment defaults
$1,500 to $5,000
Source: Techpacker, 2026
Cydney Mar’s experience in fashion and product
45+ years
As of 2026
Global product sales across retail, TV and DTC in Cydney Mar’s career
$300M+
As of 2026
Where Cydney Mar sold her own collections on QVC, over 15+ years and 800+ hours of live TV
8 countries
As of 2026

Tech pack vs spec sheet vs sketch vs sample

Founders often confuse these four. Each does a different job, and a factory needs more than a sketch and a reference sample to produce a style consistently.

Spec to Shelf comparison of product development documents, judged on the same four criteria
DocumentWhat it showsCan a factory quote from it?Best used for
Tech packSketches, materials, measurements, tolerances, construction, labels and packing for one garment styleYes, accurately, because nothing is left to defaultsSampling and producing apparel and soft goods
Product specification sheetMaterials, dimensions, tolerances, performance targets and packaging for any productYes, when it is complete and measurableNon-garment consumer products such as candles, homewares or accessories
Design sketch or mood boardThe look and feel of the ideaOnly a rough estimate; most details are missingProduct clarity and early conversations
Reference sampleA physical example of a similar productPartly; the factory still has to guess what to changeSupporting a tech pack, never replacing it

Product specifications for products that are not garments

The same thinking applies to every consumer product. A bath bomb, a scented candle or a car accessory needs a product specification sheet instead of a garment tech pack, but the job is identical: measurable requirements a supplier can quote and you can check.

Read the product specifications guide with examples

Where the tech pack fits in a product development strategy

A tech pack is one step in a longer product development strategy. Cydney Mar's Concept-to-Reality Pathway sets out six steps in order, because founders often take the right steps in the wrong order: jumping into sampling without clarity, or ignoring margins until it is too late.

Read the full product development strategy guide or see the pathway on Cydney Mar's main website.

Common questions

What is a tech pack?

A tech pack is the technical document a factory uses to make a product exactly as designed. For a garment it usually holds flat sketches, measurements and grading, materials and trims, construction details, colorways, and labeling and packaging instructions. It turns a design idea into instructions a sample room can follow without guessing, which is why a clear one reduces back-and-forth during sampling.

More in the FAQ

How much should a tech pack cost?

A tech pack’s cost depends on the style’s complexity, the number of sizes graded, and who builds it, so there is no single price. Cydney Mar does not list prices on her website. A useful benchmark is the cost of not having one: Techpacker reports that correcting garment defaults adds $1,500 to $5,000 per style in rework costs per sampling round.

More in the FAQ

Can ChatGPT make a tech pack?

ChatGPT and similar AI tools can help draft parts of a tech pack, such as a written description, a starter list of points of measure, or a checklist of sections. They cannot confirm fit, choose the right fabric for your factory, or check a physical sample. Treat any AI draft as a starting point that an experienced person reviews before it goes to a factory.

More in the FAQ

What does a fashion tech pack look like?

A fashion tech pack usually looks like a multi-page spreadsheet or PDF. Typical pages include a cover sheet with style name and number, front and back flat sketches, a bill of materials, a measurement chart with grading across sizes, construction and stitching callouts, colorways, and label and packaging placement. Templates differ, but the goal is the same: no detail left for the factory to guess.

More in the FAQ

Is a garment tech pack template enough?

A garment tech pack template is a useful structure, but it is not enough on its own. The template gives you the sections; the value comes from accurate measurements, tolerances, materials and construction details filled in for your exact style. Many founders start with a template and then have an experienced developer review it before sampling.

More in the FAQ

What is tech clothing called?

Clothing built around performance features is usually called technical apparel, performance wear or techwear. That is different from a tech pack, which is the technical document used to manufacture any garment, technical or not. A simple cotton T-shirt still needs a tech pack so the factory knows its measurements, fabric, stitching and labels.

More in the FAQ

See all questions in the tech pack and product development FAQ

Want an experienced eye on your product?

Cydney Mar guides founders of consumer products for retail, TV and direct-to-consumer through the Concept-to-Reality Pathway, from product clarity to launch.

Talk to Cydney

Published by Cydney Mar