TL;DR: A T-shirt tech pack is the controlled instruction set a supplier uses to quote, sample, produce, and inspect your garment. Before production, it should define the product, materials, measurements, construction, color or wash standard, labels, packaging, tolerances, and approval version.
A tech pack is not a mood board or a product-page description. It turns design intent into checkable requirements. If two people can read the same file and build different shirts without breaking a written rule, the file is not finished.
What should a blank T-shirt tech pack include?
A useful first tech pack covers every decision that changes fit, appearance, cost, or compliance. It does not need 40 decorative pages. It needs clear fields, named references, and one owner for each approval.
| Tech pack section | Minimum instruction | Evidence or approval |
|---|---|---|
| Product identity | Style code, revision, silhouette, intended market | Approved front and back sketch |
| Bill of materials | Shell fabric, rib, thread, labels, trims, packaging | Swatches or supplier codes |
| Measurement spec | POM name, diagram, base size, grade, tolerance | Approved size-set table |
| Construction | Seam and stitch type, SPI where critical, reinforcement | Detail photos or construction sketch |
| Color and finish | Physical color reference, wash recipe reference, shade range | Approved lab dip or retained garment |
| Artwork and labels | File, dimensions, placement, content, attachment method | Print strike-off and label proof |
| Testing and QC | Test method, sample condition, acceptance rule | Report and signed sample |
| Packing | Fold, polybag, sticker, pack ratio, carton marks | Approved packed sample |
Keep commercial terms in the purchase order, but link the PO to the exact tech pack revision. The guide to a T-shirt purchase-order QC clause explains why inspection language still needs defect definitions and acceptance rules.
How should you specify T-shirt measurements and tolerances?
Define each point of measurement, or POM, with a diagram and a repeatable method. “Chest 24 inches” is incomplete if one person measures one inch below the armhole and another measures at the armhole seam.
ISO 8559-1:2017 defines anthropometric body measurements used for clothing development. Body measurements and finished-garment measurements are different. Your tech pack must show the finished garment spec and the ease added to achieve the intended fit.
The table below is an illustrative starting format for an oversized cotton tee, not a universal tolerance standard. The supplier must confirm what its equipment, fabric, and wash process can hold.
| POM | How to measure | Illustrative size M | Illustrative tolerance |
|---|---|---|---|
| Half chest | Flat, 2.5 cm below armhole | 61.0 cm | ±1.0 cm |
| Body length | High shoulder point to bottom hem | 72.0 cm | ±1.0 cm |
| Shoulder width | Seam to seam across back | 56.0 cm | ±0.8 cm |
| Sleeve length | Shoulder seam to sleeve edge | 23.5 cm | ±0.6 cm |
| Neck opening | Inside seam, flat across | 19.0 cm | ±0.5 cm |
Do not assign the same tolerance to every POM. A 1 cm movement at the body length may be acceptable while 1 cm at the neck opening changes the collar shape. Compare the measured sample with the intended oversized boxy T-shirt specification before grading the full size range.
How should fabric and construction be written?
Write material identity and test method, not only a marketing name. “240 gsm premium cotton” does not state fiber content, knit structure, yarn type, finish, color, or whether the weight is checked before or after washing.
ASTM D3776/D3776M covers fabric mass per unit area and includes different sampling options. A small swatch result applies to that sample and does not automatically represent the full lot. State the method, conditioning, sample location, and permitted range if GSM is an acceptance point.
Construction also needs named seam and stitch requirements. ASTM D6193-16(2025) identifies stitch and seam types and explains that seam performance depends on fabric, stitch type, stitch density, thread tension, and thread strength. A photo helps, but a photo alone cannot tell the sewing line which stitch formation is required.
For each critical junction, record seam type, stitch type, stitch density if needed, thread type, and reinforcement. Link this to the approved sample rather than copying construction from an unrelated blank.
How do you lock color, wash, labels, and packaging?
Color needs a physical standard and an acceptance method. A screen screenshot is not a production standard. Pantone says its cotton swatch cards provide a textile color reference and associated spectral data can be ordered for production control.
Vintage washing needs more than a color code because abrasion, seams, rib, and panel orientation affect the result. Keep an approved garment, define the acceptable vintage-wash shade band, and identify defects that are not part of the intended variation. If color change is tested, AATCC EP1-2025 describes visual evaluation using the Gray Scale for Color Change.
Labels are not optional decoration. The FTC clothing and textile guidance states that most covered products need fiber content, country of origin, and the responsible business identity. The care instruction must also have a reasonable basis. ISO 3758:2023 defines care symbols for the most severe treatment that does not cause irreversible damage.
Show label artwork, finished dimensions, fold type, placement, seam allowance, and reading direction. Then specify the polybag, size sticker, fold method, inner pack, and carton marks using the same detail level as the T-shirt labels and packaging guide.
How should revisions and sample approvals work?
One current revision must control production. File names such as “final,” “final2,” and “latest” create avoidable disputes. Use a style code, revision number, issue date, change log, and approver.
| Stage | What is approved | What can still change | Required record |
|---|---|---|---|
| Proto sample | Basic shape and construction direction | Fit, material, details | Comment sheet |
| Fit sample | POM method and base-size fit | Grade and finish | Measured spec with comments |
| Size set | Grade across selected sizes | Minor production corrections | Size-set report |
| Pre-production sample | Production materials, construction, labels, finish | Only written exceptions | Signed approval and retained sample |
| Packing sample | Fold, bag, sticker, ratio, carton marks | Shipment-specific carton count | Packing approval |
Approve with a dated comment sheet. State whether approval is conditional and list every open issue. The blank T-shirt sample approval process explains why a stock sample, customized sample, and pre-production sample are not interchangeable.
Supplier email template
Please review tech pack [STYLE-CODE], revision [R03], dated [YYYY-MM-DD]. Quote only against this revision. Confirm any item you cannot meet before sampling, including fabric, GSM method and range, POM method and tolerance, stitch or seam requirement, wash standard, labels, testing, and packing. Return one marked copy with your exceptions. Do not begin bulk production until the pre-production sample and open-issue list are approved in writing.
Common tech pack mistakes
- Using a reference photo without measurable construction instructions.
- Mixing body measurements with finished-garment measurements.
- Writing one tolerance for every POM.
- Approving color from a phone or laptop screen.
- Changing a PDF without changing the revision number.
- Leaving labels and packing until bulk production is complete.
- Calling a proto sample a pre-production sample.
Frequently Asked Questions
How many pages should a T-shirt tech pack have?
There is no required page count. A focused blank T-shirt may fit into 8 to 12 clear pages, while a complex style needs more. Coverage and control matter more than page count.
Do I need a tech pack for a stock blank?
You still need a decoration and finishing specification. At minimum, control 1 blank SKU, artwork dimensions, placement, color approval, labels, packing, and the approved sample.
What sample should match the final tech pack?
The pre-production sample should match the approved revision and production materials. Keep 1 signed control sample, and write every allowed exception before bulk starts.
What tolerance should I use for a T-shirt?
There is no universal tolerance. Set it by POM, fabric, wash process, and supplier capability. The illustrative table above ranges from ±0.5 cm at the neck opening to ±1.0 cm at the half chest and body length.
Can a supplier create the tech pack for me?
Yes, but the brand must approve the result. Ask for 1 controlled revision, verify every measurement and material, and do not let the supplier's default become your design by accident.
Final Thoughts
A good tech pack does not guarantee good production. It removes ambiguity so sampling and inspection can expose real problems. Control the revision, approve physical references, and make every important requirement measurable before the cutting room starts.
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