T-Shirt Tech Pack: The Specification That Prevents Rework

A t-shirt tech pack is the document that decides whether a programme runs smoothly or negotiates every order. A factory can only produce what is written down, and a brief that describes a hand feel and a logo position will be interpreted differently by each sample room. The pack does not need to be long; it needs to be complete in the places that affect cost, fit and appearance. Programmes with a good pack sample once and produce repeatably, while programmes without one sample repeatedly and never quite reproduce the original.

What Does a Tech Pack Have to Deliver?

A specification that can be produced and measured.

The pack has to define the garment in measurable terms, identify the materials and decoration, and set the tolerances and references that bulk production will be checked against.

The first requirement is completeness in the decisions that matter. Fabric, colour, fit, construction, decoration, labelling and packing all have to be defined, and each definition has to be specific enough that two suppliers would produce the same garment from it. The second requirement is measurability: every claim in the pack should be checkable, which means numbers with units, named measurement points and stated tolerances rather than adjectives.

The third requirement is version control. A tech pack changes as a programme develops, and the danger is not change but unrecorded change, because a reorder produced from an outdated document will differ from the approved sample. The pack should carry a version reference and a change log, so that the approved sample and the current specification can be matched to each other.

Tech Pack Sections and What Each Contains

A working pack is organised in sections that follow the production sequence, because each section answers a question the factory will ask in the order they ask it. Fabric first, because the cloth determines most of the rest; then construction and measurements; then decoration; then labelling and packing, which are the last operations and the ones that cannot be corrected after the goods are packed.

Each section should carry the same three kinds of information: what the item is, how it will be measured or assessed, and which reference is attached. That structure makes the pack inspectable and it makes a revision obvious, because a change to a number is visible in a way that a change of adjective is not.

T-Shirt Tech Pack: Specification Lines That Prevent Rework

Most rework traces back to a small number of lines that were missing rather than to a large number that were wrong. On a t-shirt programme those lines are the fabric weight with its measurement method, the yarn type and count, the neckline band construction and height, the measurement chart with tolerance, the decoration position measured from named references, and the labelling requirements for the destination market.

Each of those lines prevents a specific failure. Weight with a method prevents a substitution on hand feel; yarn and count prevent a cloth that meets the number but not the intention; the band specification prevents a neckline that loses shape; the chart with tolerance prevents a fit that drifts across a range; the decoration reference prevents placement drift across sizes; and the labelling requirements prevent a shipment that cannot be sold in its market. LSLONG works from specifications of this kind across its t-shirt, polo, hoodie, sportswear and recovery ranges, and the conventions for reading and writing the fabric lines are set out in the yarn and stitch guide.

Measurement Chart, Tolerance and Fit Intent

The measurement section should state the base size values, the graded values for every size, and a tolerance for each point. It should also state the fit intent, because the same chart can describe a close fit or a relaxed one depending on how the garment is cut and how the ease is applied. Finally, it should name the measurement points precisely enough that two inspectors reach the same number on the same garment.

Tolerance should be set per measurement point rather than as a single figure for the whole chart, because some points matter more than others: the chest width and body length carry the fit, while the neckline opening and hem level carry the appearance. LSLONG programmes are graded across XS–5XL with a tolerance of ±0.5 cm on the measurement chart, and where a programme needs a different tolerance, the reason should be recorded so that a later reviewer understands why the chart differs from the default. Weight is verified on the finished garment to ASTM D3776/D3776M, which is the method that makes the fabric line in the pack checkable, and the relationship between yarn, stitch density and measured behaviour is described in the yarn count and stitch density guide.

Fabric, Trim and Decoration Documentation

The material section should record the cloth in enough detail to be reproduced: fibre composition, yarn type and count, knit structure, weight in g/m² with the measurement method, and the finish applied to the face. Add the colour reference for each colourway with its tolerance, and keep the approved swatch attached, because a swatch is the only complete description of a cloth.

Trims and decoration follow the same discipline. Thread, labels, interlinings, buttons or zips are recorded with their references, since a substitution in any of them changes either the appearance or the behaviour of the garment. Decoration is recorded with the route, the file reference, the finished size, the position measured from named references and the colour references, with the approved sample attached. Where the programme makes a performance or compliance claim, the supporting document belongs in the pack as well, so that the specification and the evidence travel together.

Sampling, Approval and Change Control

The pack should state how the garment will be approved, because that is what turns the document into a working process. Record which sample rounds are expected, what each round proves and which reference is produced by it, so that the approval sequence is planned rather than improvised. Where a programme includes several colourways or fits, state which of them are sampled and which are produced from the approved chart.

Change control then protects the approved state. Every revision should increment the version, record what changed and why, and identify the samples that are affected. A change to the fabric or the neckline band, for example, invalidates the fit approval, while a change to a label does not. Writing that logic into the pack prevents the most expensive error in a programme, which is producing a bulk order from a document that no longer matches the approved sample.

Quality Control and Inspection Points

Consider how the inspection section is written. A useful plan states the point being checked, the method, the size or garment selected and the acceptance criterion, in the same order that the inspection will be performed. That structure allows the plan to be executed by someone who did not write it, and it makes the report comparable between shipments, which is what allows a supplier’s performance to be judged over time rather than on the latest order alone.

The inspection section should be written from the pack rather than separately, so that each specification line has a corresponding check. That mapping is what makes an inspection plan meaningful: the factory knows what will be measured, the buyer knows what will be verified, and a dispute can be resolved against the document rather than against recollection.

The minimum inspection set for a t-shirt programme should include:

• Measurements checked at the smallest, middle and largest sizes against the chart, including tolerance.
• Fabric weight verified to the stated method, with the cloth lot recorded.
• Neckline, hem and sleeve finishes inspected on the washed garment as well as the fresh one.
• Shade compared against the approved reference under the light source recorded at approval.
• Decoration position, size and colour checked against the approved decorated sample.
• Labels, tags and packing checked against the market and retailer requirements.

Where the pack contains a performance or compliance claim, the supporting test result is checked alongside the garment, with methods published by bodies such as AATCC for appearance and dimensional checks. Independent laboratories such as Hohenstein test textiles and garments against recognised methods where a documented result is required. Material compliance can be documented through the OEKO-TEX Standard 100 framework, an organic fibre claim requires chain-of-custody support through a scheme such as GOTS, and care symbols should follow a recognised system such as GINETEX.

Reorder, Version Control and Handover

Consider how the pack is used by people who were not involved in the original development. A well-written pack is self-contained: it names the materials, the references and the tolerances without relying on a conversation, and it records which samples accompany it. That quality matters most at the moment of a change in personnel, when a programme either continues smoothly or drifts because the new team has only part of the information.

A tech pack is at its most valuable on the second order, when the people involved may have changed and the only reliable memory of the product is the document. Keeping the pack, the approved samples and the testing records together means a reorder can be produced from the specification rather than reconstructed from photographs.

Two practices make the handover work. Store the pack with its reference samples, not in a separate folder of drawings, and record the cloth lot, trim references and decoration files used on the approved order, because those are the details that make a repeat possible. Where a programme runs several seasons, review the pack before each order and confirm that the specification still matches the market’s requirements, since labelling rules and retailer standards change over time. LSLONG works from specifications of this kind across cutting, sewing, decoration and packing in Shenzhen, and material and care labelling requirements are set out in the care label compliance guide.