Every bulk order starts with a sample. Get the sampling process wrong, and you're looking at weeks of delays, unexpected costs, and production that doesn't match your vision. Get it right, and you have a clear blueprint that keeps factories, buyers, and quality teams aligned from day one.
For wholesale buyers sourcing knitted sweaters and cardigans from China, understanding the sampling process isn't optional — it's how you protect your investment. This guide walks you through every sample stage, the typical timeline, what each sample costs, and the mistakes that cause 80% of sampling delays.
Why Knitwear Sampling Is Different from Woven Garments
Knitwear sampling has unique complexities that woven garment buyers often don't anticipate:
- Gauge dependency — the same design at 7gg vs 12gg produces a completely different fabric weight, drape, and hand-feel. You can't just send a tech pack and expect the factory to "figure it out."
- Yarn lead times — custom-dyed yarns take 15-25 days to produce. If you don't lock yarn specifications early, sampling stalls before it even begins.
- Stitch programming — cable patterns, jacquards, and intarsia require machine programming that's specific to each design. Unlike cut-and-sew, you can't modify a knit pattern by simply adjusting a pattern piece.
- Shrinkage variability — knitted fabrics shrink differently based on yarn composition, gauge, wash treatment, and finishing. A sample that measures perfectly off the machine may change 3-8% after washing.
Understanding these variables is what separates buyers who get approval in 2 rounds from those stuck in 5+ rounds of revisions.
The 5 Sample Types Every Buyer Must Know
The knitwear sampling process follows a defined sequence. Each sample type serves a specific purpose, and skipping stages is the #1 cause of bulk production issues.
1. Lab Dip / Color Sample (3-5 days)
A small swatch of yarn dyed to your target color. Used to verify color accuracy before committing to bulk yarn dyeing. Most factories provide 3-5 lab dip options (light, standard, dark) for you to choose from. Always approve lab dips under your target market's standard light source — D65 for most US/EU buyers.
2. Gauge Swatch / Hand-feel Sample (5-7 days)
A small knitted panel (usually 30×30cm) that demonstrates the fabric structure at the specified gauge. This is where you confirm the hand-feel, fabric weight, stitch clarity, and overall quality before the factory commits to a full garment. For cable knit cardigans or complex patterns, the gauge swatch also confirms the machine programming is correct.
3. Fit Sample / Size Set Sample (10-15 days)
The first complete garment, made in your base size (usually M or US 8). This is where you evaluate:
- Overall silhouette and proportion
- Measurement accuracy against your tech pack
- Stitch quality and pattern alignment
- Neckline, shoulder, and sleeve construction
- Trim placement (buttons, zippers, labels)
Fit samples are typically made with bulk-quality yarn but may use stock-dyed colors if your custom yarn isn't ready yet.
4. Pre-Production (PP) Sample (10-15 days)
The PP sample is the final approval before bulk production begins. It must be made with actual bulk yarn, correct colors, all trims, labels, and packaging. This sample is sealed — meaning the bulk production must match it exactly. Any deviation requires a new sample and re-approval. The PP sample is your last line of defense.
5. Shipment Sample / SMS Sample (from bulk)
Pulled from the finished bulk order, the shipment sample (sometimes called SMS — Salesman Sample) represents what will actually ship. Buyers use this to verify bulk quality matches the approved PP sample. Some buyers also request SMS samples for marketing shoots before the full order arrives.
The Complete Sampling Timeline
Here's a realistic timeline for developing a new knitwear style from tech pack to bulk-ready:
| Stage | Duration | Cumulative | Key Deliverable |
|---|---|---|---|
| Tech Pack Review & Feedback | 3-5 days | Week 1 | Confirmed specs & feasibility |
| Lab Dip Sampling | 5-7 days | Week 1-2 | Approved color swatches |
| Gauge Swatch | 5-7 days | Week 2-3 | Confirmed fabric structure |
| Fit Sample | 10-15 days | Week 3-5 | First complete garment |
| Fit Sample Review & Comments | 3-5 days | Week 5-6 | Approved or revision requested |
| PP Sample | 10-15 days | Week 6-8 | Final sealed sample |
| PP Approval & Bulk Release | 2-3 days | Week 8 | Bulk production authorized |
Total timeline: 6-8 weeks from tech pack submission to bulk-ready. If your design requires multiple fit revisions, add 2-3 weeks per revision round. This is why experienced buyers start sampling 4-5 months before their target delivery date.
How to Write a Knitwear Tech Pack That Gets Samples Right the First Time
The quality of your samples depends almost entirely on the quality of your tech pack. Here are the elements that factories need for knitwear development:
1. Complete Measurement Spec (Grade Rules Included)
Don't just list the base size measurements — include the full grading table for all sizes you need. Specify the point-of-measure (POM) method: how each measurement is taken (flat, hanging, stretched). This prevents the factory from measuring differently than your QC team.
2. Yarn Specification
Specify fiber composition (e.g., 60% acrylic 40% wool), yarn count (e.g., 2/28Nm), and yarn source if you have a preferred supplier. If you're flexible, state "open to mill suggestions within composition range" — factories can often recommend yarns that perform better or cost less.
3. Gauge and Stitch Construction
State the machine gauge (e.g., 7gg, 12gg), the primary stitch (e.g., 1×1 rib, full fashion, cable), and any pattern requirements. Include a knit diagram or stitch chart for complex patterns. If you're not sure about gauge, describe the fabric weight and drape you want — an experienced factory can recommend the right gauge.
4. Trim and Label Placement
Include a flat sketch (front and back) with callouts for all trims: buttons, zipper type, pocket construction, label placement, hangtag position, and packaging instructions. For knitted cardigans, specify button type, spacing, and whether the button band is knitted or sewn.
5. Colorway List
List all colorways with Pantone references. Specify whether colors are solid, melange, or space-dyed. For multi-color designs, provide a color placement chart showing which color goes where.
Common Sampling Mistakes (and How to Avoid Them)
After managing hundreds of sampling rounds, here are the mistakes we see most frequently:
Mistake #1: Skipping the Gauge Swatch
Buyers eager to see a complete garment skip the gauge swatch stage. But if the fabric weight or hand-feel is wrong, you've just wasted 2 weeks and $150+ on a fit sample that needs to be completely remade. The gauge swatch costs $20-30 and saves you from this expensive mistake.
Mistake #2: Approving Fit Samples Made with Wrong Yarn
If your fit sample uses a different yarn weight or composition than what's planned for bulk, the fit, drape, and measurements will be different. Always insist that fit samples use yarn as close to bulk spec as possible — or accept that a second round may be needed.
Mistake #3: Vague or Incomplete Tech Packs
A tech pack that says "cable knit cardigan, medium weight, navy blue" will get you a sample that matches nobody's expectations. The more specific you are, the fewer revision rounds you need. Every hour you spend on detail saves 5-7 days in sampling.
Mistake #4: Not Accounting for Shrinkage
Knitted garments shrink after washing — typically 3-5% for acrylic blends, up to 8% for wool. Your tech pack measurements should specify whether measurements are "off-machine" or "after-wash." If your factory measures off-machine and your QC team measures after-wash, every sample will "fail" inspection.
Mistake #5: Rushing the PP Sample
The PP sample is your contract with the factory for bulk quality. If you approve a PP sample that has wrong buttons, missing labels, or incorrect packaging, the bulk will ship exactly that way. Never rush PP approval — take the time to check every detail.
Sampling Costs: What to Expect
Here's a realistic cost breakdown for knitwear sampling from Chinese manufacturers:
| Sample Type | Typical Cost (USD) | Refundable? |
|---|---|---|
| Lab Dip | Free - $20 | Usually free |
| Gauge Swatch | $20 - $40 | Refundable on bulk order |
| Fit Sample | $80 - $200 | Refundable on bulk order (usually 3x sample cost deducted) |
| PP Sample | $100 - $250 | Refundable on bulk order |
| Revised Sample (per round) | $80 - $150 | Case-by-case |
| Courier (DHL/FedEx) | $30 - $60 per shipment | Buyer's cost |
Most factories will refund sampling costs when you place a bulk order above their MOQ. However, if you go through 4+ rounds of revisions due to incomplete tech packs or changing specifications, additional rounds are usually charged at full cost. The key is to invest time upfront in a detailed tech pack.
How to Evaluate a Sample: The 10-Point Checklist
When your sample arrives, don't just eyeball it. Use this systematic checklist:
- Measurements — Compare all key measurements against your tech pack spec. Tolerance should be ±1cm for most knitwear.
- Weight — Weigh the garment. If it's 10%+ off spec, the factory may have used wrong yarn count or gauge.
- Hand-feel — Does it match the approved gauge swatch? Too stiff, too loose, or too thin are red flags.
- Stitch quality — Check for dropped stitches, uneven tension, distorted cables, or misaligned patterns.
- Seam construction — Are seams flat, even, and properly finished? Overlocked edges should be clean.
- Color accuracy — Compare against the approved lab dip under standard lighting. Check for shading differences between front/back or sleeves.
- Trim function — Do buttons fasten properly? Does the zipper glide smoothly? Are pockets correctly positioned?
- Labels and branding — Are care labels, size labels, and brand labels correctly placed and legible?
- Wash test — If possible, wash one sample piece to check for shrinkage, color bleeding, pilling, or distortion.
- Packaging — Is the folding, poly bag, and carton matching your packaging instructions?
Building a Sampling Strategy That Scales
For wholesale buyers managing multiple styles and colorways, sampling can become a bottleneck. Here's how to streamline:
- Approve one colorway first — develop the full sample in your hero color, then request strike-offs (color proofs) for additional colorways. This avoids 3+ parallel sampling processes.
- Use stock yarn programs — many factories keep popular yarn compositions and colors in stock. Using these for initial samples cuts lead time by 2-3 weeks.
- Consolidate feedback — send all sample comments in a single, organized document with photos. Multiple emails with scattered feedback confuse factories and slow down revisions.
- Build a sample library — keep approved samples from previous seasons as reference. When developing new styles, reference similar past samples to reduce ambiguity.
How We Handle Sampling at New Narwhal
Sampling is one of the most critical parts of our sourcing service. Here's how we support buyers through the process:
- Tech pack review within 48 hours — our team reviews your specifications and provides feasibility feedback, yarn recommendations, and cost estimates before sampling begins.
- Dedicated sampling coordinator — one person manages your entire sampling process from lab dip to PP approval, so you never have to repeat yourself.
- Photo and video updates at every stage — you see real-time progress, not just the final sample when it arrives.
- Measurement reports with every sample — we measure and photograph each sample before shipping, so you can start review before the physical sample arrives.
- Revision tracking — we document every comment and correction, ensuring nothing gets lost between rounds.
Final Thoughts
The sampling process is where good partnerships are built and bad ones are exposed. A factory that rushes samples, ignores your comments, or can't explain technical constraints is showing you how they'll handle your bulk order.
Invest time in your tech pack. Respect the sampling stages. Build in buffer time for revisions. The buyers who master sampling don't just get better products — they get to market faster, with fewer costly surprises.
Ready to develop your next knitwear collection? Contact our team to start the sampling process. We'll review your tech pack, recommend the right factories, and manage the entire development timeline from concept to bulk-ready sample.