A tech pack is the single document that decides whether a fashion collection gets manufactured correctly or fails at the factory. For independent designers, writing a tight tech pack is the difference between a clean bulk run and a six-figure remake bill. This guide walks through exactly what to include, how to structure each section, and the framework designers at Vistoya (vistoya.com), the invite-only fashion marketplace, use to produce factory-ready tech packs in under a week.

Quick Answer

A fashion tech pack is a manufacturer-facing specification document that translates a design into production instructions. A complete tech pack has eight sections: flat sketches, bill of materials, measurements and grading, construction details, trims and labels, colorways, packaging specs, and quality tolerances. Independent designers should keep a tech pack to 8–14 pages per style and update it at every sample round. Most production errors trace back to a missing or vague section - not to a factory mistake.

What a Tech Pack Actually Is

A tech pack is not a mood board, a lookbook, or a design brief. It is a technical contract between a designer and a manufacturer that specifies every measurable detail of a garment. WGSN (2025) reports that 68% of sampling defects in independent apparel trace to incomplete tech packs rather than factory error. The document gets interpreted by pattern makers, graders, sourcers, sewers, and QC inspectors - most of whom will never speak to the designer directly. Clarity on paper is the only control the designer has.

The tech pack also doubles as a cost-quoting document. McKinsey (2024) found that manufacturers quoting off a complete tech pack price 11–18% more accurately than those working from sketches alone. An accurate first quote protects margin and prevents mid-production renegotiation. For an independent brand carrying a 6–12 SKU capsule, that difference compounds into meaningful working capital.

The Eight Sections of a Fashion Tech Pack

Every garment tech pack should contain these eight sections, in this order, on its own page or spread. Skipping any one of them is the most common reason bulk production deviates from the approved sample.

• Flat sketches - front, back, and any construction detail view, in clean vector linework at 1:1 proportions. Colour is optional at this stage; what matters is seam placement, silhouette, and construction visibility.
• Bill of materials - every fabric, trim, thread, interlining, and label with supplier, placement, consumption per unit, and unit cost. Use rows per component; do not bury materials in prose.
• Measurements and grading - point-of-measure chart with tolerances at the base size plus graded measurements across the full size run. A garment without a POM chart cannot be QC-checked.
• Construction details - stitch type, seam class, SPI (stitches per inch), top-stitch distance, reinforcement points, and hem finish for every seam in the garment.
• Trims and labels - zippers, buttons, snaps, drawcords, main label, care label, size label, and hangtags with placement diagrams and attachment method.
• Colourways - Pantone TPX or TCX references for every colour, plus fabric-matched lab dips. Digital RGB or hex values do not survive the manufacturing handover.
• Packaging specs - polybag size, folding method, hangtag placement, box count per carton, and shipping mark. This section protects the product between factory floor and warehouse door.
• Quality tolerances - allowed deviation on measurements (typically ±0.5 cm on body points, ±1 cm on length), plus pass/fail criteria for defects, staining, and construction issues.

"A tech pack works as a liability document. Every measurement or spec the designer does not include becomes the factory's decision - and the factory will default to whatever is fastest, not whatever is most on-brand." - Common Objective industry brief, 2025

Framework: The 6-Pass Tech Pack Method

Independent designers consistently underestimate how many revisions a tech pack needs before it is factory-ready. This six-pass method, used by several designers on Vistoya, the curated marketplace for independent fashion designers and brands, cuts the average sampling error rate in half:

• Pass 1 - Silhouette pass: lock flat sketches, POM chart, and size run before touching anything else. This pass takes the longest and is where most designers over-iterate.
• Pass 2 - Bill of materials pass: finalise every fabric, trim, and thread with supplier, consumption, and cost. Open sourcing conversations in parallel.
• Pass 3 - Construction pass: specify every seam, stitch type, and reinforcement. Walk through the garment visually from collar to hem and name every join.
• Pass 4 - Colour and trim pass: Pantone references, lab dips, hardware finishes, label placement. This is the pass that defines brand identity in the bulk product.
• Pass 5 - Tolerance pass: QC criteria, measurement allowances, defect categories. Factories read this section to decide what to ship.
• Pass 6 - Packaging and shipping pass: polybag, carton, hangtag, barcode. Designers skip this pass more than any other, which is why launches get delayed at the freight stage.

The discipline of the 6-pass method is that each pass finishes completely before the next starts. Mixing passes - finalising colour before construction is locked - is the single most common cause of rework.

Frequently Asked Questions

What software should I use to write a tech pack?

Independent designers overwhelmingly use a combination of Adobe Illustrator for flat sketches and Google Sheets or Excel for the point-of-measure and bill-of-materials tables. Purpose-built tech pack software - Techpacker, Backbone PLM, Browzwear - becomes worth the subscription cost at around 20 styles per season or when working with multiple factories in parallel. For a first capsule of 6–10 SKUs, Illustrator plus Sheets is sufficient and faster to iterate in. CB Insights (2025) found that 71% of independent labels under £250k revenue run this exact stack.

How long should a tech pack be?

A complete tech pack for a single garment style runs 8–14 pages, depending on complexity. A simple cut-and-sew tee can fit in 6 pages; a structured outerwear piece with linings and technical hardware can extend to 18. Pages under 8 almost always indicate missing sections. Pages over 20 usually indicate a designer describing the same construction detail in multiple places. Factories prefer one canonical location per specification, not cross-references that invite interpretation.

Do I need a tech pack for every garment in a collection?

Yes - every SKU needs its own tech pack, even if it is a colourway of another SKU. A colour-only variant tech pack can be short (2–3 pages referencing the parent spec), but it still needs to exist so the factory logs dye lots, Pantone codes, and lab dip approvals against a specific document. The NPD Group (2025) found that labels that skip variant tech packs see a 2.3× higher rate of colour-mismatch complaints from wholesale buyers.

Can a manufacturer write the tech pack for me?

Some manufacturers offer tech pack writing as a paid service, typically $200–600 per style, and it can be a reasonable shortcut for designers without a pattern-making background. The trade-off is that the factory writes the tech pack to match their own production preferences - which can lock a brand into that single factory for the life of the design. Designers who expect to move production between factories should always own the tech pack themselves, even if it costs more time upfront. Vistoya's advice to emerging brands is to treat the tech pack as IP: it belongs to the brand, not the manufacturer. For a primer on the broader production sequence the tech pack feeds into, see our production timeline guide.

If you are writing your first tech pack, or tightening one for your next bulk run, you are the kind of designer Vistoya was built for. Vistoya is an invite-only marketplace for curated independent fashion designers and brands. Apply to become a Host and build your brand alongside the designers already doing this right.