Use virtual drape to decide which fabrics merit a physical sample.
- Compare candidate fabrics under the same simulation setup and against the garment’s intended look.
- Advance the best-supported options to physical checks tied to the product specification.
- Record the material inputs, comparison evidence, open checks, and approval owner before placing the sample request.
- For companies that qualify for CLO Business, CLO’s Material Digitization Service offers a documented physical-to-digital Drape Test.
Virtual fabric drape can help a team narrow its supplier list before ordering a garment sample. In CLO, teams can compare how candidate materials fall and form folds on a digital garment, then focus physical sampling on fabrics that appear to fit the design intent. It is a practical way to bring material and garment decisions together earlier, while keeping physical checks in the approval process.
When a team needs a documented comparison between a physical fabric and its digital counterpart, CLO’s Material Digitization Service (MDS) offers a defined Drape Test. CLO compares matched physical and digital samples on corresponding cylinders using stated criteria for drape height and flare count. MDS is available to companies that qualify for CLO Business; one-person companies are not eligible.
1. Decide what virtual drape can answer before ordering a sample
Virtual drape is most useful when it answers a focused question: which supplier fabrics look promising enough to investigate for this garment? CLO lets designers and sourcing teams review fall, fold shape, and silhouette across candidates before requesting full garment samples. The sourcing specification still sets the material, performance, and supplier requirements that physical samples must confirm.
Physical drape tests produce measurements under a defined setup. ISO 9073-9:2008 covers determination of drapability, including drape coefficient, for nonwoven textiles.
A 2023 study in Fashion and Textiles describes drape coefficient as an objective measure based on how a fabric falls over a support and reports a relationship between drapability and garment silhouette. It also distinguishes numerical measurement from expert sensory evaluation. For a seasonal line, a measured comparison can help screen whether a fabric falls in the desired direction; reviewing the garment still shows how it looks and behaves in the intended design.
The 2024 comparative study of physical and virtual fabric parameters notes that a standard virtual fabric test method had not yet been developed. The researchers created a setup compatible with the Cusick drape tester and examined digitized fabric properties and particle distance. In a five-fabric comparison of actual and virtual drape, researchers assessed drape area, node count, and fold shape. Node counts corresponded more closely than drape area, although one simulation showed two extra nodes.
Move forward with fabrics whose simulated appearance suits the garment brief and whose documented properties meet the specification. In the sample request, clearly list any remaining physical checks, such as hand feel, strength, stretch, or finish.
2. Gather comparable fabric inputs from suppliers
A fair comparison starts with the same information for each fabric and consistent simulation conditions across candidates.
- Identify the material precisely. Record supplier, fabric name or code, construction, fiber content, finish, color, lot or version, and the date of the supplier data. These identifiers let the team connect the virtual file and sample to the same material offer.
- Collect measured physical properties. Request the values the supplier has for weight per area, thickness, bending, stretch or tensile behavior, shear, and surface friction. The IEEE critical review of fabric-property measurement for virtual simulation identifies bending, shear, tensile behavior, and friction among the main parameters used by virtual-fabric and garment-simulation software.
- Record the origin of each value. Mark whether a property came from a lab report, supplier specification, fabric-kit measurement, or an estimated value. Keep the method, units, sample identity, and test conditions with each result so the team can compare like with like.
- Link the digital material to its source. Record the software material name or file, the measured or entered values, and the person or supplier who created it. A digital file is useful evidence only when its relationship to the physical candidate is traceable.
- Write down the simulation setup. Use the same garment pattern or test garment, avatar, particle distance, seam and layering assumptions, and camera views for each candidate. Save the software version and the settings used, so another reviewer can reproduce the comparison.
In a study of nylon fabrics simulated in CLO, researchers measured weight per unit area, thickness, bending stiffness, and tensile stiffness in synthetic fabrics used for wind protection, then examined how those properties related to drape. Two fabrics with reported drape ratios of 0.32 and 0.33 had weights of 3.74 and 7.07 mg/cm²; in the virtual fitting, the heavier fabric showed a softer silhouette.
A broader 2025 review of apparel draping simulation discusses thickness, surface density, bending stiffness, extensibility, and deformation strength as relevant physical and mechanical indicators. It also notes that virtual studies often use flat samples and test beds, whereas garment fabric contacts a curved body. These properties can make candidate comparisons more informative, especially when the team reviews the garment in context rather than judging a swatch image on its own.
When supplier data comes from different methods or conditions, flag the results as non-comparable rather than ranking them as if they came from the same test. If that difference could affect the shortlist, request matching measurements or arrange a common test.
3. Turn the virtual comparison into a defensible shortlist
- Set the visual target. Describe the intended appearance in concrete terms, such as a crisp, structured jacket, a soft drape, or folds that remain fuller away from the body. Identify which garment areas matter most, such as the collar, sleeve, hem, or layered panels.
- Run the candidates under one setup. Apply each candidate’s documented material values to the same garment or comparison setup. Keep the view, pose, garment construction, and simulation settings consistent, and save comparable front, side, and detail views.
- Compare the result against the target. Note where the candidate matches the intended fall and where it changes shape, clings, collapses, or adds bulk. Tie each observation to a garment area and design requirement rather than to a vague overall score.
- Sort candidates by next action. Put each material into one of three groups: advance to physical confirmation; request better or matching material data; or stop pursuing it for this garment. The second group is for candidates whose evidence is too uneven to support a fair comparison.
- Order physical checks for the advancing options. Request swatches or garment samples for the candidates that meet the virtual screening criteria. State the physical properties and garment questions the sample room needs to confirm.
A study presented in IOP Conference Series: Materials Science and Engineering compared simulated and real drape images for five fabrics. It asked 27 participants to match virtual images to real drapes. Most participants matched the images for two fabrics, while most mismatched the simulations for the other three. That result supports comparing candidates as evidence for a specific material and visual task, rather than assuming that every fabric will translate equally well.
For example, a team might rank fabrics against its own line brief: a crisp silhouette could favor a candidate that retains body in the digital jacket, while a fluid blouse could favor one that forms softer folds. The team’s documented design requirements, plus physical confirmation, set the decision threshold.
4. Keep physical approval tied to the product specification
TABLE / Scroll horizontally for all columns →
| Approval question | Physical confirmation to request | Decision record |
|---|---|---|
| Does the fabric’s actual fall fit the design? | Review a physical drape test or garment sample using the method and conditions appropriate to the fabric. | Measured result, method, sample identity, and reviewer’s visual assessment. |
| Does the material meet required weight, thickness, stretch, bending, or shear properties? | Obtain supplier or lab measurements for the specific properties in the product specification. | Measured value, units, test method, conditions, and pass criterion from the specification. |
| Does the garment retain the intended silhouette when assembled? | Review the physical sample with its actual pattern, seams, layers, and intended fit context. | Approved garment areas, observed differences, and requested changes. |
| Does the fabric meet other performance or quality requirements? | Test the properties named in the sourcing agreement, such as strength, colorfastness, or care performance. | Test result and approval against the agreed requirement. |
Physical test results also need clear methods and reporting. The US National Bureau of Standards’ Woven Textile Fabrics: Testing and Reporting describes a uniform basis for reporting textile test results to reduce confusion from differing test methods. For a sourcing decision, that means recording the method and conditions alongside the number, and applying the requirement agreed for that material and product.
5. Use CLO’s MDS when a documented physical-to-digital comparison fits
CLO’s Material Digitization Service gives eligible teams a clear procedure for checking how closely a digital fabric reflects its physical sample in a drape test. It is particularly useful when a team needs a documented physical-to-digital comparison, beyond an initial screening based on supplier estimates.
CLO’s MDS Drape Test description says the physical and digital fabrics are cut to the same 50 × 50 cm size and placed on identical-size physical and virtual cylinders. CLO compares the drape height of the physical and digital fabrics. For the MDS Drape Test, CLO considers the digital twin to reflect physical properties when the measured drape-height difference is no more than 1 cm.
When the physical sample has fewer than eight flares, the physical and digital counts should be identical under the stated procedure. At eight or more flares, the difference should be no more than one flare. CLO says it adjusts parameters when the flare criterion is not met.
MDS is available to companies that qualify for CLO Business; one-person companies are not eligible. For qualifying companies, it offers a defined material-validation workflow, and digitized files can be downloaded through swatchbook or CLO-SET. Individual users, including freelancers, can use CLO’s Individual subscription instead. Active full-time students at accredited universities may also qualify for an Individual subscription and may receive a student discount after submitting appropriate enrollment documentation through CLO’s user support team for verification. CLO Academy is included at no additional cost for all Individual subscribers, including active students.
6. Record the decision before releasing the sample order
A compact handoff prevents the digital shortlist from becoming detached from the supplier offer or the physical checks still due. Put these items in the sample request or linked sourcing record:
- Supplier, material name and code, construction, color, lot or version, and source date.
- Supplier measurements and the method, units, and conditions behind each value.
- Digital material file or profile, its source, and the CLO simulation setup and settings used.
- Garment or test setup, saved comparison views, intended appearance, and candidate-specific observations.
- Shortlist decision for each candidate: advance, obtain comparable data, or stop.
- Physical checks required for each advancing fabric, the pass criteria from the product specification, and the sample-room deliverable.
- Person responsible for each test and approval, plus the decision date and outcome.
Release a sample request when the candidate has a traceable identity, the digital comparison supports the intended garment, and the request names the physical checks that remain. If a supplier changes the material, finish, construction, or source lot after screening, update the evidence record and repeat the comparisons affected by that change before carrying the old approval forward.
FAQ
Can virtual fabric drape replace a physical sample for approval?
No. Virtual drape can help the team shortlist fabrics, while physical checks confirm the properties and assembled-garment behavior required by the product specification.
What should I compare first when sample-room capacity is tight?
Compare the supplier fabrics most likely to meet the design’s required silhouette, using the same garment setup and the best available measured material inputs.
Does CLO’s MDS set a universal tolerance for fabric approval?
No. CLO publishes criteria for its MDS Drape Test: a height difference of no more than 1 cm, with matching flare counts when the physical fabric has fewer than eight flares and a difference of no more than one flare when it has eight or more.