Moving Your Customer Measurements to a New Factory

The email came with a CSV attached and a subject line that said everything: 300 customers, ready to move. The shop had been with another factory for four years, the fit had started drifting between orders, and the owner had decided to switch. She had done the hard part already, she thought. Every customer record was in the file: name, measurements, last order date, construction, cloth. Three hundred rows, forty-odd columns, everything a factory could need.

I opened the file, picked a row at random, and asked her one question. When your fitter measured this customer's chest, was the tape over the shirt or over the waistcoat he was wearing? She did not know. Neither did the file. And that single missing detail, shirt or waistcoat, is enough to shift a chest measurement by two centimetres, which is enough to make a jacket that pulls across the front or gaps at the button.

That is the gap between moving your customer measurements to a new factory and actually moving your fit. The numbers are the easy part. The hard part is everything the numbers assumed.

Why the same numbers make a different suit

Every made-to-measure factory cuts from a base pattern. When your measurements arrive, they are not drawn onto cloth from scratch. They are applied as adjustments to a pattern the factory already holds, one that carries its own proportions, its own ease allowances, and its own assumptions about where the body bends and where the cloth should sit.

Two factories can receive the same chest, waist and shoulder numbers and produce two visibly different jackets, because the pattern underneath is different. One factory's base might carry more chest ease. Another might set the armhole higher. A third might draft the shoulder with a millimetre more slope. None of these is wrong. Each is a design decision built into the pattern, and your measurements are interpreted through it rather than overriding it.

Our own system runs to 47 measurement fields, 31 of them required. That is more fields than most shops are used to sending, and even so, the numbers are only half of what we need. The other half is what those numbers were supposed to produce, and that is something only a finished garment can show us.

This is why a spreadsheet alone does not transfer a fit. It transfers data. Whether that data produces the same result at a new factory depends on whether the new factory's pattern, ease conventions and tolerances match the old one's. They almost never do, because they were never designed to.

What your measurement record actually carries

A measurement record is a set of numbers taken on a specific day, under specific conditions, by a specific fitter. That sentence contains three variables, and all three affect the outcome.

The day matters because bodies change. A customer measured in January and reordered in October may have gained or lost weight, and neither record is wrong. The conditions matter because a chest measured over a dress shirt and a chest measured over a T-shirt are two different numbers for the same person, and neither the fitter nor the spreadsheet always records which one it was. The fitter matters because two people measuring the same shoulder will not always agree on where the bone ends, and our measurement guide exists partly to make that conversation explicit rather than assumed.

Beyond the raw numbers, a fit record carries notes. Sloping left shoulder, add 5 mm. Erect posture, shorten back. Prominent seat, add room below the waist. These notes are the adjustments your fitter learned across multiple orders, and they live in the margin of the spreadsheet or in the fitter's memory, not in the measurement fields themselves. When you move to a new factory, those notes are as important as the numbers, and far easier to lose.

The construction specification matters too. A jacket cut for half canvas sits differently from the same measurements cut for fused, because the internal structure changes how the front drapes over the chest. If your old factory made half canvas and your new one defaults to fused, the fit will change even if every measurement is identical, and neither factory made an error. Our full canvas, half canvas and fused guide shows the difference from the inside out.

The reference garment is the bridge

The most reliable thing you can send a new factory is not a spreadsheet. It is a suit.

Pick a jacket your customer already wears and approves. One that sits the way your shop sells. Send it to the new factory with the measurement record and fit notes attached, and ask the factory to match its pattern, construction and details to that garment. The garment carries every decision the spreadsheet assumed: the ease, the drape, the shoulder line, the button stance, the length. It is the answer to the question the numbers cannot answer on their own, which is what the fit is supposed to look like.

At our end, the switching supplier process starts here. We receive the reference, match our pattern to it, and cut a one-piece trial for a real customer order. The minimum is one piece, so the trial is a normal order, not a special arrangement. Production is 14 days from the confirmed order, plus shipping. The trial arrives, the shop fits it on the customer, and the notes come back. Only after the trial passes does volume move.

This is slower than uploading a CSV and hoping for the best. It is also the only way to catch a fit gap before the customer catches it for you, and a customer who notices a fit change at the fitting is a customer deciding whether to come back.

Checklist: moving your customer base without losing the fit

If you are planning a switch, run through this list before the first order goes out.

1. Choose three reference customers. Pick one whose fit you know well, one whose body is difficult, and one who reorders often. If the new factory can match all three, it can handle the rest.
2. Send a finished garment for each. Include the measurement record, fit notes, construction specification and the cloth weight. If you do not have a garment to send, send the most recent order details and flag it as untested.
3. Ask how the factory takes measurements. Our system uses 47 fields, 31 required. Another factory may use 25 or 60. The number matters less than knowing which fields do not map, so you can fill the gap before the first cut rather than after the first fitting.
4. Confirm the construction. Fused, half canvas or full canvas, and whether the factory makes all three. If your customers are in half canvas and the new factory defaults to fused, the fit will change on the first order.
5. Check the cloth. Ask whether the cloths your regulars reorder are available from the new factory, or whether substitutes are needed. A fit change and a cloth change on the same order are two variables where one is already too many. We source from 33 mills and cloth merchants, 26 of them in Europe, and a digital swatch book is available on request.
6. Run the trial on a real customer. Not a mannequin, not a staff member trying it on for five minutes in the back room. Put the trial on the customer who will wear it and collect the same fit notes you would on any first order. Our first-sample checklist applies here exactly.
7. Keep the old supplier running. Do not cut off the old factory until the trial passes. Orders in progress stay where they are. New customers go to the new factory first, because they have no history with the old fit. Existing customers move at their next reorder, with their full record.
8. Transfer customer by customer, not in bulk. A bulk migration means every customer's next order is the first order from a new factory, and every fitting is a test. Spreading the transition across reorder cycles means problems surface one at a time, when they can still be fixed, rather than all at once.

What a spreadsheet can and cannot do

A clean, complete spreadsheet is useful. It tells the new factory how many customers you have, what constructions they wear, which cloths they reorder, and what the measurement distribution looks like. That is planning information, and it saves time.

What the spreadsheet cannot do is guarantee that the customer who ordered a 42 regular last year will receive a jacket that fits the same way from a different factory. The number 42 means one thing on one pattern and a slightly different thing on another, and the difference shows up at the chest, the shoulder or the armhole before anyone opens a tape measure.

The reference garment solves this because it skips the translation problem entirely. Instead of asking the new factory to interpret your numbers through its own pattern, you are asking it to reproduce a result you already approved. The numbers come along for documentation, but the garment is the spec.

If you are comparing suppliers before you commit to the switch, the MTM suppliers compared page puts minimums, lead times, cloth sourcing and construction side by side, from what each supplier publishes on its own site. And if the reason you are looking is that fit has started drifting or remakes are dragging on, the switching supplier checklist walks through the four problems that make shops move and the questions to ask before you do.

See prices and your margin, 3 min. Or tell us what you are making now and we will tell you what a trial against it should look like.