WHAT MAKES A GREAT GARMENT TECH PACK — AND WHY IT MATTERS MORE THAN YOU THINK

In apparel manufacturing, a poorly specified tech pack doesn't just slow production down — it shows up in your final garment, whether or not anyone notices where it went wrong.

By Mettaloom June 11, 20266 min read Howrah, West Bengal

6 Core components

5 Sampling stages to bulk

±0.3-1.5cm Tolerance, by POM type

~1cm Typical size-to-size grade

A tech pack is, on the surface, just a document. A few pages of measurements, sketches, and notes that travel from a brand's design team to a factory floor on the other side of the world. But in practice, it is the single most important reference in the entire production cycle — and most apparel startups and even some established brands underestimate it badly.

We have seen well-designed garments run into avoidable trouble in bulk production because the tech pack behind them was vague or incomplete.

We have also seen technically demanding styles come together cleanly on the first sample because the tech pack left no room for misinterpretation.

In our experience, the difference between those two outcomes is rarely the factory's skill. It is almost always the quality of the tech pack itself.

"A tech pack is not paperwork. It is the only language a designer's vision speaks fluently on a factory floor thousands of kilometres away."

— Production philosophy, Mettaloom Howrah

Why the garment tech pack is the backbone of apparel manufacturing

When something goes wrong in bulk production — a fit issue, a wrong trim, a mismatched colour — the instinct is often to question the factory floor.

In our experience reviewing tech packs across hundreds of styles, the root cause is more often upstream: a specification that assumed something it never actually stated.

A garment moves through pattern makers, cutters, sewing operators, and finishers — many of whom never speak directly with the original designer. The tech pack is the only document speaking on that designer's behalf at every one of those stages. Where it is silent or ambiguous, each person along the line has to make a judgment call, and judgment calls made independently rarely align.

The six components every garment tech pack needs

Not every tech pack needs to be complicated. But every well-built one used in professional apparel product development includes these six components, done properly.

01 Component One

Technical Flat Sketches — Front and Back

Every tech pack needs flat technical sketches, front and back, showing every seam line, stitch detail, and construction feature. Not a fashion illustration — a precise, to-scale technical drawing.

This is the first thing a pattern maker reads, before a single measurement. If the sketch is unclear, everything built from it inherits that confusion.

✏️Front + back views📐To-scale proportions🧵Seam & stitch detail marked

02 Component Two

Point of Measure (POM) Sheet

This is the spine of the entire tech pack. Every measurable point on the garment — chest width, body length, sleeve length, neck opening — listed with an exact measurement and an acceptable tolerance, graded across the full size range.

Tolerance is not one flat number. It varies by POM and by fabric type. As a general guide: body measurements such as chest and length typically run ±1cm to ±1.5cm, sleeve length ±0.5cm to ±1cm, and small details like collar height or cuff width ±0.3cm to ±0.5cm. Knitwear generally carries more tolerance than tightly woven fabrics, due to natural stretch and recovery behaviour.

A POM sheet without stated tolerances invites inconsistent results across a production run — each operator effectively sets their own standard.

📏Tolerance varies by POM type📊Graded across full size range ✅Every measure point listed

03 Component Three

Bill of Materials (BOM)

Every fabric, trim, button, zipper, label, and thread used in the garment — listed with exact specifications, supplier reference where applicable, and placement on the garment.

A BOM with a vague entry like "matching thread" instead of an exact shade reference is how colour mismatches surface across a large production run.

A complete BOM also extends to packaging components — polybag specifications, care label content, hang tag placement, and carton configuration — so that packing instructions are never left to verbal handover at the end of the line.

🧵Exact thread & trim references🔘Supplier reference noted📦Packaging specs included

04 Component Four

Construction & Stitch Detail

Stitch type, seam finish, and construction method for every key area — collar attachment, hem finish, side seams. This is where a "simple-looking" garment can quietly become technically demanding.

A flatlock seam, for example, lies flatter against the body and reduces chafing — a meaningful detail for next-to-skin kids' knitwear, where seam irritation against sensitive skin is a real and recurring concern. An overlock seam finishes the raw edge but sits with more bulk, and is more typical of woven garments. The construction method chosen changes both comfort and durability, and needs to be specified rather than left to factory default.

🪡Stitch type per seam🔄Seam finish specified👶Skin-contact comfort considered

05 Component Five

Grading Rules & Size Chart

Grading defines how each measurement increases or decreases between sizes — typically applied as a fixed increment per POM (for example, roughly a 1cm change in chest width between adjacent sizes), rather than a uniform scale-up of the whole garment.

Without clearly defined grading rules, a factory has to interpret how a size Medium becomes a size Large — and interpretation at scale produces inconsistent fit across the size range.

This matters even more in kids' wear, where small grading errors are immediately visible to a parent comparing two sizes side by side.

📈Fixed increment per POM👕Full size range covered🎯Consistent fit logic

06 Component Six

Color Standards — Pantone References & Lab Dips

Color is one of the most subjective elements in apparel manufacturing unless it is anchored to an objective standard. A tech pack should reference an approved Pantone (TPX/TCX) code or an approved physical lab dip for every colorway — not a verbal description like "navy" or "forest green," which different people, screens, and dye lots will interpret differently.

The factory dyes or sources fabric against the approved lab dip and confirms it within an agreed color tolerance before bulk dyeing proceeds. Skipping this step is one of the more common — and more expensive — causes of shade rejection at final inspection.

🎨Pantone TPX/TCX reference🧪Approved physical lab dip ✅Confirmed before bulk dyeing

Where the tech pack meets the sampling process

A tech pack is not a one-time handover. It evolves alongside the standard apparel sampling sequence, with the factory referring back to it — and updating it — at every stage:

Sampling stage

Purpose

Proto / design sample

Concept

Fit sample

Fit check

Size set

Grading check

Pre-production (PP) sample

Final sign-off

Top of production (TOP) sample

Bulk verification

At each of these stages, ambiguity in the tech pack tends to surface as a question, a revision, or — if missed — a defect carried forward into the next stage. A POM left untoleranced, a colour referenced only by name rather than Pantone code, or a grading rule left unstated will typically resurface at the fit sample or size set stage as an avoidable round of revisions.

This is not about chasing a guaranteed number of sampling rounds saved — every style, fabric, and brand relationship is different. It is about recognising that the categories of ambiguity described above are the ones we see most often cause rework, and that a complete tech pack closes off most of them before production planning even begins.

What this means for you as a brand

A complete tech pack is the cheapest insurance you can buy.

• →Fewer open questions during fit sample and size set review, since less is left for the factory to interpret

• →Lower risk of bulk-stage rework, which is consistently more expensive than a sample-stage correction

• →More consistent fit and shade across every size and every production run

• →A factory that can move with confidence because nothing critical needs to be guessed or assumed

• →A clear, shared record of what was agreed — useful if a dispute about specification ever arises

The part a checklist cannot fully capture

The human element

A tech pack is a conversation, even when no one is talking.

At Mettaloom, our merchandising team reads every tech pack before production planning begins — not just to check it is complete, but to understand the designer's actual intention behind it.

Sometimes a measurement looks unusual, and instead of simply following it blindly, we reach out and ask. Is this intentional? Is this a typo? That single question, asked early, has saved entire production runs more than once.

A tech pack is, in the end, a form of trust between a designer who cannot be in the room and a factory team determined to honour their vision exactly as intended. We take that trust seriously, on every single style, every time.

Build it once. Build it well.

A tech pack takes real time to build properly, and it is tempting under deadline pressure to send something incomplete and resolve the gaps later.

In our experience, those gaps are rarely resolved cleanly later. They tend to surface mid-process — as a question if the factory catches them early, or as a defect at final inspection if no one does.

A small upfront investment in a complete, well-specified tech pack consistently pays back across the sampling process, the production run, and the final product your customer receives.