This page teaches how a virtual sample is actually built, step by step, from a confirmed tech pack, for a merchandiser at Delta Garments who has just received Order B's own tech pack and needs to produce the first sample the buyer will see, before any fabric has been cut or sewn. This lesson mainly teaches product: what goes into a virtual sample and in what order. It starts the moment a tech pack is confirmed and ends once a virtual sample is ready for the buyer's own review.
A factory that builds a virtual sample straight from the tech pack's measurements alone, without first measuring the real fabric's own weight, drape and stretch, produces an image that looks like the garment but does not behave like it, so the buyer's own review is based on a shape rather than on the fabric that will actually be cut. A factory that skips building a virtual sample altogether, and waits for a physical proto sample before showing the buyer anything, gives up the day-one design feedback a virtual sample can deliver quickly.
You need: to know what a tech pack contains (measurements, fabric, trims, construction and artwork) and that Order B's own fabric is a stretch denim, not a stable knit. No specific earlier lesson in this course is required.
By the end of this lesson you can:
Not covered here: deciding which sample round a virtual sample can replace, already covered in Lesson 2.1, judging fit on a virtual sample without a real body (Lesson 2.3), and deciding when a virtual sample still needs a physical sample to confirm it (Lesson 2.4).
| Term | Meaning |
|---|---|
| Virtual sample | A 3D digital representation of a garment, built from a tech pack and a fabric's own digitized properties, that can be viewed and checked before any physical garment exists. |
| Fabric digitization | Measuring a physical fabric's own weight, drape and stretch, then entering those values into a 3D tool so a virtual sample behaves like the real cloth. |
| Tech pack | A document that specifies exactly what a garment is: measurements, fabric, trims, construction and artwork, that a factory produces against. |
| Marker layout | The cutting layout that arranges a garment's pattern pieces on a length of fabric before cutting; it must fit inside the fabric's usable width, not its full width. |
| Drape | How a fabric falls and moves on the body. |
| Point of measure | A specific place on a garment, such as body length or half chest, where a measurement spec states a required value. |
A virtual sample is not created by loading a pattern shape onto a screen; it is built by combining three separate inputs: the pattern pieces from the tech pack, the construction details that say how those pieces join, and the fabric's own digitized properties, its weight, drape and stretch, measured from a real physical swatch. Skipping the fabric digitization step and using a generic default fabric setting in the 3D tool produces a virtual sample that looks like the garment's shape but does not move or hang the way Order B's own denim actually will, because a stretch denim with 2% elastane drapes and recovers differently from a plain cotton fabric of the same weight.
| What can differ | The shapes you meet | Why it matters |
|---|---|---|
| Export vs. domestic order pace | An export order like Order B, with a buyer reviewing from another country, benefits most from a fast first virtual sample the buyer can react to before the next physical round; a domestic order with a nearby buyer may schedule a physical proto sample sooner regardless | Building speed matters more when the reviewer is far away and each physical round costs a full courier or travel cycle |
| Make to Order vs. Make to Stock behind the order | An MTO order like Order B has one confirmed fabric batch to digitize; an MTS reorder of a proven style can reuse fabric data already digitized for an earlier run of the same fabric, saving the digitization step entirely | Reusing digitized fabric data only works when the actual fabric batch has not changed |
| A stable knit vs. a stretch woven fabric | A stable single jersey knit, like Order A's fabric, needs simpler digitization since it drapes predictably; Order B's stretch denim with 2% elastane needs its stretch recovery measured carefully, since a small error there changes how the whole virtual sample fits | Underinvesting in digitization for a stretch fabric produces a less reliable virtual sample than the same shortcut on a stable fabric |
| A complete tech pack vs. a tech pack missing construction details | A costable, complete tech pack gives the 3D tool everything it needs on the first pass; a tech pack missing a construction detail, such as a seam allowance, forces a guess that the virtual sample will show incorrectly | A virtual sample cannot be more accurate than the tech pack it is built from |
| Product families | The same three-input method applies whether the product is apparel, socks and hosiery, knit-to-garment, terry and towels, or home textiles and bedding | A factory new to virtual sampling often starts by digitizing its most common fabric, such as a plain jersey, before tackling a more complex fabric like stretch denim |
Northline Apparel confirms Order B's tech pack for 3,000 pieces of five-pocket jeans, 12 oz denim with 2% elastane, with a 22-week timeline that gives the approvals stage 3 weeks before fabric buying begins in bulk. Delta Garments' merchandiser receives a physical swatch of the actual denim from Suez Denim, the mill supplying this fabric, and sends it for digitization before touching the 3D tool's pattern-building screen. Only once the fabric's own weight, drape and stretch recovery are entered does Delta Garments build the pattern pieces and construction details from the tech pack into the same file.
Skipping straight to the pattern step, using the 3D tool's own default denim setting instead of the actual Suez Denim swatch, would have produced a virtual sample days sooner, but it would not reflect this specific fabric's own 2% elastane recovery, which is the exact property Northline Apparel needs to see before approving the design for physical sampling.
The worked numberThe 3-day virtual sample build is 2 days faster than the 5-day physical proto sample it replaces, but only because Delta Garments spent the first 2 of those 3 days digitizing the real Suez Denim swatch rather than skipping straight to the pattern. Skipping digitization would have cut the build to 1 day, but the resulting virtual sample would not show Order B's own 2% elastane recovery accurately.
A common mistake is skipping fabric digitization to save the 2 days it takes, using the 3D tool's own built-in default setting for "denim" instead of the actual Suez Denim swatch supplied for this order. This produces a virtual sample that looks correct on screen but does not carry Order B's own real stretch recovery, so a buyer approving the design from that image is approving a fabric behaviour that will not actually appear once real denim is cut and sewn. The cost shows up once the physical fit sample is finally made and does not match what the virtual sample showed, forcing a second design review that the digitization step would have avoided.
A virtual sample is not just a picture of a pattern; it needs real information about how the actual fabric behaves, not only its measurements. Skipping the step of measuring the real fabric and only using a generic setting produces an image that looks right but moves differently from the real cloth once it is cut and sewn. On Order B, digitizing the actual stretch denim takes 2 of the 3 days needed to build the virtual sample, but that time is what makes the sample trustworthy, and the whole build still finishes 2 days faster than the physical proto sample it replaces.
Delta Garments' 3D technician asks the merchandiser for permission to skip digitizing the Suez Denim swatch and use the 3D tool's own built-in default denim setting instead, to send Northline Apparel the virtual sample a day earlier. The facts in front of the merchandiser:
The technician's message:
Should the merchandiser approve skipping the fabric digitization step to save a day? Decide before you open the decision.
No, the fabric digitization step should not be skipped; the time saved does not justify the accuracy lost.
Two facts decide this. First, this lesson's own rule states that a virtual sample is only as accurate as the fabric data entered into it, and the default denim setting assumes no stretch, while Order B's own fabric carries 2% elastane, a difference the buyer's design review depends on seeing correctly. Second, skipping digitization saves 2 days, not the 1 day claimed, since digitizing the swatch is the larger of the two build steps; the technician's own estimate of the time saved was wrong.
Digitizing every fabric on every order regardless of stretch content would also be excessive; a stable, non-stretch fabric can sometimes use a closely matching default setting. The point is that Order B's own stretch denim specifically needs its real recovery measured, which the default setting cannot provide.
The USD 80 net loss is illustrative, since not every skipped digitization leads to a second review; some fabrics are close enough to a default setting that no problem appears. It shows why digitizing a stretch fabric like Order B's own denim is worth the 2 days it costs, rather than risking a repeated round later.
Use the T25-C02 Virtual sampling decision tool. For Order B, enter the fabric's own digitized weight, drape and stretch recovery, and the time each build step takes; the sheet compares the virtual sample build time against the physical proto sample it may replace.
[Download the Virtual sampling decision tool](../../templates/T25-C02-virtual-sampling-decision-tool.xlsx)
1. Why does a virtual sample need the fabric's own digitized weight, drape and stretch recovery, not only the tech pack's measurements?
2. In the case in this lesson, why did digitizing the Suez Denim swatch take 2 of the virtual sample's 3 build days?
3. A different order uses a stable, non-stretch cotton fabric very close to a 3D tool's own built-in default setting. What does this lesson's method suggest?
| EN | AR | FR | TR | Meaning |
|---|---|---|---|---|
| Virtual sample | العينة الافتراضية | Échantillon virtuel | Sanal numune | A 3D digital representation of a garment, built from a tech pack and a fabric's own digitized properties, that can be viewed and checked before any physical garment exists. |
| Fabric digitization | رقمنة القماش | Numérisation du tissu | Kumaş dijitalleştirme | Measuring a physical fabric's own weight, drape and stretch, then entering those values into a 3D tool so a virtual sample behaves like the real cloth. |
| Tech pack | حزمة المواصفات الفنية | Fiche technique | Teknik paket | A document that specifies exactly what a garment is: measurements, fabric, trims, construction and artwork, that a factory produces against. |
| Marker layout | تخطيط الماركر | Plan de placement (marker) | Marker düzeni | The cutting layout that arranges a garment's pattern pieces on a length of fabric before cutting; it must fit inside the fabric's usable width, not its full width. |
| Drape | الانسدال (الدرابيه) | Tombé (drapé) | Dökümlülük | How a fabric falls and moves on the body. |
| Point of measure | نقطة القياس | Point de mesure | Ölçü noktası | A specific place on a garment, such as body length or half chest, where a measurement spec states a required value. |
You now know how a virtual sample is built from a tech pack. The next lesson moves to the buyer side of the same kind of order and shows how to judge a virtual sample's own fit before it has ever been seen on a real body. Back to the course map