I'm a quality compliance manager at Outlast. My job is to review fabrics—fleece, denim, linen, velvet, upholstery weaves, custom webbing—before they go to customers. I check roughly 200 unique items a year, and in 2024 I rejected about 11% of first production lots. Not because suppliers are crooked. Mostly because samples are polished and production is messy.

This checklist is for anyone who buys fabric on spec: apparel manufacturers, furniture makers, industrial purchasing agents. It's also for brands who work with a supplier like us and want to double-check our work. Eight checks, plus a bonus. If you're sourcing custom fleece for athleisure, velvet for futons, or upholstery fabric for hotel furniture, these are the exact tests I'd run before signing off.

Why I Wrote This

Let me be blunt: most fabric quality issues don't show up in a pretty showroom sample. They show up after washing, after a season of sunlight, or when the seam starts to slip away from the weave. I'd rather help you understand the gray areas than have you discover them in a container you can't return. This isn't about making you an expert—it's about making you a better buyer.

The 8-Point Fabric Quality Checklist

1. Read the Spec Sheet with Suspicion

Every supplier sends a spec sheet full of numbers: abrasion cycles, tensile strength, tear strength. The first thing I do is look for the test method. Martindale and Wyzenbeek are not interchangeable—same idea, different abrasive and pressure. A fabric that passes 60,000 Martindale rubs might fail after 20,000 Wyzenbeek cycles. If the supplier says 'approved for heavy-duty upholstery' without a standard, ask for the actual report.

Honestly, I'm not sure why some mills hesitate to share the raw test report until you sign an NDA. My best guess is that they know the numbers have caveats. But if you're spending thousands on fabric, you have a right to see the full test. Why does this matter? Because a spec number without a test standard is just a marketing claim.

2. Test Shrinkage for the Way You'll Actually Use It

Standard shrinkage tests are done in a gentle cycle. But if you're making fleece hoodies that customers will wash hot and throw in a dryer, the standard test tells you almost nothing. I learned this one the hard way. We sourced a custom fleece that looked great on the spec sheet—3% shrinkage after 3 washes, tested according to AATCC 135. The production fabric shrank 7% after three heavy-duty washes. The catch? The sample was tested with a delicate setting. Our client's customers don't use delicate.

So do this: ask for shrinkage data under the washing conditions you plan to put in the care label. If needed, pay for a pre-production wash test. It cost us about $50 per fabric in January 2025 at a third-party lab—cheap compared to a return nightmare.

3. Check Colorfastness to Light, Not Just Washing

Colorfastness to washing is standard. Lightfastness is often skipped—especially for velvet and upholstery fabrics. If the fabric will see direct sunlight, test to ISO 105-B02 or a comparable standard. A velvet futon cushion that fades in three months becomes a customer complaint you'll hear about long after the sale.

We tested a dark blue linen blend for a client in 2024. The sample looked great in the showroom, but after 200 hours of simulated sunlight it had visibly lost depth. That discovery led to a coating change and saved probably 2,000 units of returns (ugh, the thought of those returns still stings).

4. Check Seam Slippage and Tear Strength

The prettiest fabric in the world fails when a seam pulls open under stress. Seam slippage is a common issue in upholstery velvet, especially looser weaves. Ask for seam slippage test per ASTM D4034 and tear strength per ASTM D1424. A decent supplier will provide them quickly. If they hesitate, that's a red flag.

From the outside, it looks like fabric strength is one number. The reality is that strength at the face doesn't always translate to strength at the seam. The weave geometry matters more than people think.

5. Don't Forget Custom Webbing and Trim

If you're sourcing custom webbing for bags, straps, or industrial use, the same idea applies but with different metrics. Check width tolerance, elongation, and breaking strength. We've seen a batch of 'non-elastic' nylon webbing stretch 8% under a working load because the supplier's tension during measurement differed from ours. Now every PO we place includes the measurement conditions.

What to ask for: a force-elongation curve, not just a breaking strength number. It tells you how the webbing behaves in real use.

6. Test Your Upholstery Fabric Protector Before You Recommend It

For furniture buyers, the 'best fabric protector for upholstery' is not a one-size-fits-all choice. A protector that works beautifully on polyester velvet can turn yellow on certain acrylic blends or change the hand feel on linen. People assume expensive protector equals better performance. Actually, performance largely depends on the fiber, finish, and application, not the price.

A quick field test takes two days: spray a sample, let it cure for 24 hours, check water beading. Then rub an untreated and treated swatch side by side to see if the protector changes the color or texture. It's not a lab test, but it catches the big surprises.

7. Inspect the Physical Sample—and Check Pilling for Fleece

Specs are important, but your hands and eyes still matter. Look at the fabric under natural light. Run your palm across it in both directions. Fold it to see if it creases. Tilt it to inspect for luster streaks or uneven dye. Check the back of the fabric—quality issues often show up where no one looks.

For brushed fabrics like performance fleece, ask for pilling resistance too (ASTM D4970 or ISO 12945-2). A label that says 'forever fleece' doesn't mean the fabric never pills; it means the supplier hopes you won't notice. If you're comparing to a popular fleece like Athleta's Forever Fleece, the pilling test gives you a measurable comparison—not just a feel. A good fleece should score 3–4 on the 5-point scale after 10,000 cycles. We tested one custom fleece in 2024 that looked soft but had a pilling score of 2 after just 2,000 cycles. It would have been a disaster in athleisure wear.

8. Order a Pilot Lot Before You Commit to a Container

A pilot lot—50 to 100 meters or a few hundred units—is the cheapest insurance you'll ever buy. It tests three things: production accuracy, lead time, and communication. If a supplier nails a small order, their systems probably work. If they miss the color, roll length, or wrapping on a pilot, imagine what happens on a real order.

Looking back, I should have insisted on pilot lots for every first-time client instead of waiting for the big order. At the time, I didn't want to delay the launch. The cost of that delay was much higher than the pilot would have been.

Bonus: Ask About the Supplier's Internal Rejection Rate

It feels awkward, but ask the mill how many meters they reject internally per order. If a mill says zero, they either have superb processes—or they hide defective rolls to be picked up by the buyer. A good mill will admit to a 1–2% internal rejection rate and back it up with records.

That last one came back to me in 2022, when a supplier who promised 'zero defects' sent a container where 4% of the rolls had shading issues. Our final inspector caught it before it went to the customer, but it cost us two weeks. Now 'internal rejection rate' is a routine question.

Common Mistakes I Still See (Even from Experienced Buyers)

Trusting the sample over the production roll. Samples are often selected from the cleanest part of the roll. Your inspection should compare production rolls against an archived reference sample, not just a PDF spec.

Skipping finish tests. Some finishes (water repellent, flame retardant, antibacterial) wash off or age out. If your product needs that finish to perform, test the finish after its first cleaning cycle.

Not keeping a physical reference sample. Cut a sample from the approved roll, sign it, date it, and store it in a dark drawer. If a dispute comes up, you have physical proof—not just an email.

Final Thought

I know this checklist is a lot. My goal isn't to scare you off fabric buying. It's to give you a repeatable process and a shared vocabulary, so you and your supplier are talking about the same things. In my experience, an informed customer asks better questions and makes faster decisions. That's good for both sides.

If you're sourcing something like custom fleece, velvet for futons, or performance upholstery fabric, take these eight steps with you. You'll still get some headaches—that's the nature of textiles. But you won't get blindsided by the ones I've listed here.