Fabric Quality Inspection: 4 Checks Before Cutting (Face Side, Nap, Defects, Skew)

Once the cutter goes through a roll, every error gets expensive. Nobody can re-dye a wrong-side panel, and no press can straighten a skewed stripe inside a finished garment. That is why we treat fabric quality inspection as a pre-cutting step, not a final audit.

In practice, the inspection covers four things:

• Face and back: which side should face out on the garment.
• Nap direction: which way the pile or brushed surface lies.
• Defects: what is wrong with the roll, where it came from, and how serious it is.
• Bow and skew: whether the weft or course line runs straight across the width.

None of these checks needs a lab. A light table, good daylight, a ruler and a trained hand catch most problems. Still, each check has a few details that people miss.

Check 1: How to Identify the Face Side of Fabric

Some fabrics make the face side obvious. Others look almost the same on both sides, and a busy sewing line can easily mix them up. The result is uneven shade between panels, broken or mismatched patterns, and in bad cases a garment that clearly looks “inside out” in one section.

Looking and touching come first in any fabric quality inspection. After that, the weave structure, the print, special finishing effects, the selvedge, and even the labels and stamps on the roll all give clues.

Read the Weave Structure

Plain weave. Plain-woven fabric looks nearly identical on both sides, so daily production usually treats it as having no face or back. Printed plain weave is the exception. If you must choose, pick the side that looks smoother and cleaner, with brighter, more even color.

Twill. Twills come as single-faced or double-faced. A single-faced twill shows a crisp diagonal line on the face and a blurred one on the back. Direction helps too. On single-yarn twills, the face line usually runs from upper left down to lower right. Half-line and full-line twills, which use ply yarn in the warp or in both directions, run the other way, from lower left up to upper right. Double-faced twills show nearly the same line on both sides, just angled the opposite way.

Satin. The satin face carries long warp or weft floats, so it feels dense and smooth and has a clear sheen. Turn it over and the back looks somewhere between plain and twill, with a much duller luster.

Our QC team keeps one quick rule in mind during fabric quality inspection: warp-faced twills and satins show more warp floats on the face, while weft-faced twills and satins show more weft floats on the face.

Compare Print, Color and Pattern Clarity

On almost any printed or patterned fabric, the face has sharper outlines and fuller color. The back looks washed out and flat, and the pattern loses its depth. In our sample room, we check this part of fabric quality inspection under a D65 light box. Most of the time, the answer takes a few seconds.

Check Jacquard, Dobby Stripes and Checks

Jacquard, woven-check and woven-stripe fabrics vary more in their weave. The face usually has fewer floats, and its stripes, checks and figures look cleaner, with a softer shine. The back looks blurred and darker.

There is one real exception. Some jacquards have a back side that looks quieter and more refined, and designers occasionally choose it as the face. That works fine as long as the yarn structure is sound, the float lengths are even, and the choice doesn’t hurt durability. To be honest, a few of the nicest sample garments we’ve seen used the back of a jacquard exactly this way.

Look at the Selvedge

The selvedge on the face usually lies flatter and firmer, while the back edge tends to curl inward. Fabric from shuttleless looms gives an extra clue: the back edge shows a small fringe of weft tails, and the face edge stays neat. Some higher-grade wool fabrics carry text or numbers woven into the selvedge. On the face, the characters read clearly. From the back, they look fuzzy and mirror-reversed.

Use Finishing Effects: Pile and Burnout Fabrics

Pile and raised fabrics. Dense, upright pile covers the face, while the back shows the bare ground weave. Velvet, velveteen, corduroy and plush all follow this pattern. On some very dense piles, you can’t even see the ground weave from the front.

Burnout fabrics. Mills create burnout patterns with chemicals. On the face, the pattern outline looks clear and layered, and the color stays bright. If the burnout sits on a pile ground, the face pile looks full and level, as on burnout silk or burnout velvet.

Labels and Inspection Stamps on the Roll

Before shipping, the mill normally labels and stamps each piece. On fabric for the Chinese domestic market, the label goes on the back, and the date and inspection stamps at both ends of each piece also sit on the back. Export goods have traditionally followed the opposite rule, with labels and stamps on the face. Conventions vary between mills, so we always ask the supplier to confirm in writing when it matters for a program, and we note it on the fabric quality inspection sheet.

Check 2: Nap Direction in Pile and Brushed Fabrics

Corduroy, velveteen, velvet, plush and many wool fabrics have a nap direction. Telling face from back is easy on these fabrics. The pile direction is the real trap.

The test is simple. Stroke the surface with your hand. If the fibers rise against your palm, you are going against the nap. If they lie flat and smooth, you are going with it. The color changes too, so a panel cut the other way can look like a different shade under shop lighting.

On corduroy, the corded side is clearly the face. What really matters is choosing whether to cut with the nap or against it, and then keeping that choice consistent. Cut nap fabrics in one direction, piece by piece, so the body and all secondary parts share the same pile direction. Otherwise the finished garment looks patchy. That’s why nap direction has its own line on our fabric quality inspection sheet.

The same logic applies to fabrics with a shot or lustrous effect, where the color shifts with viewing angle, and to asymmetric checks. Handle them like wool or corduroy with a nap. In our own work, we see the same thing on brushed knits. A small brushed swatch looks uniform, yet a full panel cut upside down reads half a shade darker.

Check 3: Fabric Defects and How to Handle Them

Defects are one of the most important things a fabric quality inspection looks for. They come from three main stages.

Where Fabric Defects Come From

• Yarn defects: poor fiber quality or problems in spinning.
• Weaving defects: faults that the loom or knitting machine creates.
• Dyeing and finishing defects: faults that printing, dyeing or finishing introduces.

On an inspection report, buyers usually see four categories: raw yarn defects, grey fabric defects, yarn-dyed fabric defects, and printed or dyed fabric defects. The category tells you which supplier in the chain should fix the problem. On knitted fabric, a hole or a shade band can start on the knitting floor or in the dyehouse, so it pays to know how to assign responsibility for knitting and dyeing defects before anyone files a claim.

How to Mark and Grade Defects

Cut out serious defects. In wool and silk fabrics, mills traditionally mark lighter defects by tying a short piece of string on the selvedge next to the fault. Other fabrics, such as viscose or poly-cotton, carry no string. Instead, the inspector grades the roll by how serious its defects are.

Many international buyers grade rolls with the 4-point system in ASTM D5430. Whatever grading method your fabric quality inspection uses, agree on it with your supplier before bulk starts. Different grading options can give quite different point totals on the same roll. For woven goods, width, density and shrinkage also belong in the bulk check, and our guide to woven fabric inspection standards walks through those tests.

Cutting Around Defects

Small defects hurt appearance. Larger ones also weaken strength and abrasion resistance in that spot. So the cutting team should avoid defects wherever possible. When that isn’t possible, place them in areas that see little rubbing and little visibility, never on a front panel, cuff or knee. If your fabric quality inspection logs each defect by position, the cutter can plan around it before laying the marker.

Check 4: Bow and Skew in Fabric, and How to Correct It

During weaving and finishing, machine tension can pull the weft out of line. Chinese mills call this weft skew, and English trade terms usually split it into bow and skew. It may show up as skewed checks, skewed patterns, or skewed weft yarn. Skewed checks are the most common, especially on brushed check flannels, and they are also what a rushed fabric quality inspection misses most often.

Three Forms of Weft Distortion

• One-sided skew: one edge of the width sits higher than the other, so the weft runs on a slant.
• Center bow: the weft dips in an arc across the middle of the width.
• Side bow: the weft dips in an arc on one side only, left or right.

ASTM D3882 sets out how to measure bow and skew, both for filling yarns in wovens and for courses in knits. For knits, our fabric quality inspection also includes a wash check, because some skew only appears after laundering. Yarn twist is often the hidden cause there, and we explain the mechanism in our note on why fabrics skew after washing.

Why You Should Fix Skew Before Cutting

Whatever its form, distortion left uncorrected hurts both the look and the build of the garment. On check or horizontal-stripe fabrics, the stripes won’t line up between left and right panels or between front and back. Even on solid colors, an off-grain panel makes the garment twist and refuse to hang flat. Actually, this is the version customers notice most: the side seam creeps toward the front after a few washes, and the garment looks badly made even though the sewing was fine.

How to Correct Weft Skew

Manual correction. Spray the fabric with water until it is damp, and then have two people pull it in the direction that counters the skew. It works, but it is slow and physically hard.

Machine correction. Garment factories design and build most skew-correcting machines themselves. A typical unit has five parts: a frame, a drive system, a steam spray unit, an adjustable weft-pulling device, and a heated ironing cylinder. It saves labor and runs much faster. Badly skewed fabric may need several passes before it holds straight.

From our factory view, correction is a last resort. When a mill keeps sending rolls with bow or skew, the better fix sits upstream: steadier tension on the stenter and a fresh look at the finishing settings.

A Practical Fabric Quality Inspection Routine for Sampling and Bulk

Our team follows this short routine when a new fabric arrives for development:

1. Mark the face side with a chalk arrow on every roll as soon as you unpack it.
2. Stroke-test pile, brushed and shot fabrics, and add the nap direction to the same arrow.
3. Run at least the first meters of each roll over a light table and log defects by type and position.
4. Measure bow and skew at several points along the roll, not only at the start.
5. Wash one cut panel before approving bulk. Shade, twist and shrinkage all show up here.

This fabric quality inspection routine takes less than an hour per roll in the trial stage. Compared with recutting a whole bulk order, it is cheap insurance.

Fabric Quality Starts With the Yarn

Many problems that surface during fabric quality inspection begin before the loom. Uneven yarn, wrong fiber content or contamination passes straight into the fabric, and no finishing step can fully hide it. Stray polypropylene or hair, for example, often stays invisible until dyeing, which we cover in our note on foreign fibers in cotton fabric. That is why our QC desk checks incoming yarn before it goes near the dye house, and why we keep lot records that trace a fabric problem back to a specific yarn batch.

FAQ: Fabric Quality Inspection

What does a fabric quality inspection cover before cutting?

It covers four checks: face side, nap direction, defects, and bow or skew. Most of the work needs only a light table, a ruler and a trained eye, plus one wash test on a cut panel.

How can I tell the right side of a fabric quickly?

Check print clarity, twill line sharpness, satin sheen and the selvedge first. The face usually looks cleaner and brighter, and its edge lies flatter.

Do all fabrics have a nap direction?

No. Nap direction matters mainly for corduroy, velvet, velveteen, plush, many wool fabrics, brushed knits and fabrics with a shot or lustrous effect.

Can you still use skewed fabric?

Often, yes, if you correct it before cutting, by hand or by machine. Heavily skewed check fabric may need several correction passes, and some rolls should go back to the mill.