Sourcing Clothes From China: Getting Your Size Right

A buyer in Texas lost $47,000 last week.

Not on fabric. Not on bad stitching. On size.

She ordered 5,000 “Medium” hoodies. Got back 5,000 kids’ costumes. The factory swore they followed her size chart. They did. Problem? Her chart said “Chest: 40cm.” She meant 40 inches. The factory cut 40 centimeters.

Nobody caught it until the container landed in Houston.

Here’s the truth about clothing sizes from China: There is no “Medium.” There is no “Large.” There’s only numbers. And if you don’t speak those numbers correctly, you’re buying expensive rags.

Why Your Size Chart Is Probably Garbage

Most buyers send a size chart that looks professional. Clean rows. Nice fonts. Totally useless.

You write “Medium” and assume the factory knows what that means. They don’t. A Chinese “Medium” fits like an American “Small.” Sometimes an “Extra Small.” Depends on the region, the factory, the day of the week.

Last month I walked a garment factory in Dongguan. Asked the boss what “Large” means. He pointed at a shirt. It would’ve fit my 12-year-old nephew.

The owner wasn’t lying. That’s just what “Large” means in his world.

The Language Trap Nobody Warns You About

Here’s what happens: You send measurements in inches. The pattern maker converts to centimeters. Rounding happens. Then the cutter “adjusts” because the fabric is slightly thicker than the sample batch.

By the time your shirt gets sewn, it’s lost two inches in the chest and gained an inch in the sleeves.

Nobody tells you this.

A brand I worked with last year ordered 10,000 women’s dresses. Size “Small” came back fitting like tents. The factory insisted they followed the tech pack exactly. They did. The tech pack said “Bust: 34.” Factory cut it at 34 inches, but they added 2 inches of “ease” because “ladies need room to breathe.”

That ease? Nobody asked for it. It was just factory tradition.

What Suppliers Say vs. What They Mean

This table isn’t a joke. These are real quotes from real suppliers in the last six months.

The $0.15 Mistake That Cost $28,000

A swimwear brand wanted to save money. Factory quoted them $8.20 per piece using standard elastic. Buyer found another factory at $8.05. Saved 15 cents per unit.

Smart, right?

Wrong.

The cheaper factory used thinner elastic. After two washes, every waistband sagged. Returns flooded in. By the time they tallied the damage—refunds, shipping, customer service hours, re-manufacturing—they burned $28,000.

All to save $0.15 per swimsuit.

Here’s the thing about sizing: Cheap materials shrink different. Cheap thread stretches different. Cheap labor cuts sloppy. You save a dime on the invoice and lose a dollar on every return.

Sizing isn’t just about getting the numbers right on day one. It’s about those numbers staying right after wash three, wear ten, and six months in a closet.

The Measurement Points Most Buyers Forget

You probably have chest, waist, and length on your size chart. Great. That covers maybe 40% of what matters.

Here’s what you’re missing:

• Armhole depth: Too shallow? Can’t lift your arms. Too deep? Looks like a potato sack.

• Shoulder slope: Flat shoulders vs. sloped shoulders. Chinese patterns default to flat. Westerners usually need slope.

• Rise (for pants): The distance from crotch to waistband. Mess this up and your jeans become a medieval torture device.

• Neck opening: T-shirts that choke you or hang like a scoop neck when you wanted a crew.

• Sleeve pitch: The angle of the sleeve. Get it wrong and the sleeve twists around your arm like a barber pole.

• Hip curve (for women’s wear): Straight-cut vs. contoured. Chinese factories default to straight. Doesn’t work for most body types outside Asia.

I’ve seen buyers spend three weeks negotiating price, then send a size chart with six measurements and pray.

That’s not sourcing. That’s gambling.

The Conversation You Need To Have (And Record)

Last year I sat in on a call between a buyer and a Guangzhou knitwear factory. Here’s how it went:

Buyer: “We need the chest measurement at 42 inches for size Large.”

Factory: “Yes, 42. No problem.”

Buyer: “And that’s the finished measurement after sewing, right? Not the pattern measurement?”

Factory: “Yes yes, finished.”

Buyer: “Measured flat, chest pit to pit, not full circumference?”

Factory: “Uh… full around?”

Buyer: “No. Flat. Pit to pit. That means 42 inches lying flat. Which is 84 inches full circumference.”

Factory: “Oh! You mean half measurement. Okay okay, we understand now.”

That’s a near-miss. If the buyer hadn’t pushed, the factory would’ve cut the chest at 42 inches full circumference. The shirt would’ve fit like shrink wrap.

You need to have this exact conversation. Out loud. On a recorded call. Make them repeat it back in their own words.

I’ve got a client who requires the factory to send a video of the pattern master measuring a sample while reading the measurements aloud in both centimeters and inches. Overkill? Maybe. But they haven’t had a sizing disaster in two years.

Grading: The Thing That Breaks Your Entire Line

Let’s say your size Medium is perfect. Great. What about Small and Large?

This is called “grading.” Going up or down in size while keeping the proportions right.

Most factories grade by adding or subtracting 2cm across all measurements. Chest goes up 2cm, waist goes up 2cm, length goes up 2cm. Simple math.

Also completely wrong.

A real body doesn’t scale like a balloon. When chest size increases, the shoulder width might only increase by 1cm, but the armhole depth needs to go up by 3cm. The waist might increase faster than the hips.

Bad grading is why you’ll get a Medium that fits perfect and a Large that looks like it was designed for a different species.

Two months ago, a factory in Jiangsu graded a women’s blazer line. They increased every measurement by exactly 5cm per size. Sounds logical until you see the 2XL blazer with armholes so deep the lining showed at the sides. Looked like a vest with sleeves stapled on.

The fix? We brought in a pattern maker from Hong Kong who actually understood body proportions. Cost an extra $800. Saved the entire 8,000-unit order from being trash.

Tolerances: The Lie You’re Told

Every factory will tell you their tolerance is +/- 1cm or +/- 2cm.

What they mean is: “We’ll try, but if we’re off by 3cm, we’re shipping it anyway and hoping you don’t check.”

Standard tolerance in the garment world is +/- 1cm for critical measurements (chest, waist, length) and +/- 2cm for less critical (sleeve length, hem width).

But here’s reality: Tolerances stack.

If the chest is off by +1cm and the shoulders are off by +1cm and the armholes are off by +1cm, suddenly your shirt is 3cm bigger than you wanted. Multiplied across five measurement points? You’ve got a totally different garment.

I walked a production line in Shenzhen two weeks ago. Watched a cutter eyeball a stack of fabric and slice. No marker. No guide. Just vibes. When I measured the pieces, the variation was 4cm on a chest panel.

The factory called it “within tolerance.”

I called it what it was: junk.

Pre-Production Samples Are Your Only Lifeline

You cannot skip pre-production samples for clothing. You can’t.

Here’s the process that actually works:

1. Send your tech pack with every measurement in both inches and centimeters

2. Require a pre-production sample in every size you’re ordering

3. Receive samples and measure them yourself with a tape measure

4. Try them on real human bodies in your target market

5. Wash them three times and measure again

6. Document any deviations and send a revision list

7. Repeat until samples are perfect

8. Only then approve mass production

Skipping any of these steps is asking for a container full of clothes that don’t fit anyone.

A sporting goods company I worked with last year thought they could skip the wash test on pre-production samples. They approved based on fresh-out-of-the-box fit. After the first wash, the shirts shrank 8% in length. Became crop tops.

Entire order went to a liquidator. Lost $64,000.

The QC Inspection You Actually Need

Most QC inspections for garments check stitching, fabric defects, and packaging. Fine. But if they’re not checking measurements on random samples from the production run, you’re wasting money.

We did an inspection last month for a denim brand. Factory passed on stitching and fabric. But when we pulled 20 random pairs of jeans and measured, 12 of them had waist measurements that varied by more than 3cm from the approved sample.

Factory claimed it was “normal variation.” We called it what it was: garbage quality control.

The brand rejected the lot. Factory had to recut. Delayed shipment by five weeks, but saved the brand from a return nightmare.

A good QC team will pull samples from the beginning, middle, and end of the production run. Measure at least 10 critical points per garment. Compare against your approved pre-production sample. Anything over tolerance gets flagged immediately.

We’ve caught sizing disasters three days before shipment more times than I can count. That’s the point. Catch it in China when you can still fix it, not in your warehouse when it’s too late.

What You Should Check Right Now

Pull out your current size chart. Go look at it.

Does it specify every measurement in both inches and centimeters? Does it note whether measurements are taken flat or full circumference? Does it include tolerance ranges? Does it specify measurement locations with diagrams?

If you answered “no” to any of those, your next order is a coin flip.

Here’s your 10-minute task: Email your factory right now. Ask them to send a photo of the actual pattern they’re using for your garment. Not the tech pack you sent them. The physical pattern.

If they hesitate, you know they haven’t even made your pattern yet. If they send it and the measurements don’t match your chart, you just saved yourself a disaster.

Do it now.