What is a technical designer?

A technical designer is the person who turns a design into instructions a factory can sew from, then checks that what comes back matches what was approved. They write the tech pack, set the measurements and grade rules, review each sample, and write the fit comments that go back to the workroom. The design belongs to the designer. The technical designer makes sure it comes through production intact.

I work as a technical designer, so this is the job described from the inside. In a large company it is a full role, often with its own team. In a small label it is usually a hat someone wears for a few weeks on each style, or a person brought in for that part of the work.

What a technical designer does

The details change from company to company, but most of the work falls into five parts.

• Tech packs. Flats, construction notes, seams, bill of materials, labels and colourways: the pages a factory sews from. What is a tech pack? goes through each sheet.
• Specs. The points of measure for the base size, each with a number, a tolerance and a diagram of where it is taken.
• Grade rules. How the base size steps through the size run, written as a base plus a step for each point. What is pattern grading? covers how a factory uses them.
• Fit. Reviewing each sample, measuring it against the spec, deciding what changes, and writing it down.
• The workroom. Answering the factory’s questions, and asking yours before they turn into guesses.

None of these is the design itself. Each one is a decision about how the design is made, written so that someone else can carry it out without you in the room.

How it differs from a fashion designer

A fashion designer decides what the garment is: the shape, the fabric, the colour, the detail that makes it worth making. A technical designer decides how that is achieved in a factory, in a given size, within a tolerance, the same way across a whole run.

The two overlap, and the work depends on that overlap. When a collar cannot be sewn as drawn, or a hem width will not grade cleanly into the larger sizes, the question goes back to the designer. The answer is a design decision. The technical designer’s part is to make sure the question is asked before fabric is cut, not after.

In a small label, the designer and the technical designer are often the same person. That works, as long as the second job gets its own time. Most packs that come back full of questions were written by someone who already knew the answers and forgot that the factory did not.

How it differs from a pattern maker

A pattern maker turns the garment into pattern pieces, the flat shapes that are cut from fabric and sewn together. Their skill is in the shape itself: how a sleeve sits in an armhole, where ease goes, how a curve is drafted so it sews flat.

A technical designer writes what the pattern has to achieve, and checks whether it did. The spec says the bust is 92 cm in the base size. The pattern maker drafts a pattern that measures 92 cm once sewn. The technical designer measures the sample and writes down whether it does, and what to change if it does not.

Some technical designers draft patterns, and some pattern makers write specs. In many factories the pattern maker also grades. Where the line sits depends on the workroom. What matters is that someone owns each part, and that everyone is working from the same numbers.

Fit comments

Fit is where most of the work becomes visible. A sample arrives, goes on a form or a fit model, and every point of measure is checked against the spec. Then comes what the numbers do not show: a shoulder that pulls toward the back, a placket that ripples, a hem that dips at the side.

Fit comments are written as instructions, numbered, with a photo or a marked flat. “Lower hem 2 cm at centre back, keep side length” can be sewn. “Hem feels short” cannot. Each comment should say what changes, by how much, and on which sizes, because a change to the base size can change the grade.

I have seen a good sample go through three more rounds because the comments were vague, and an average one corrected in a single round because they were exact. The quality of the comments decides how many samples you pay for.

Talking to the workroom

Much of the job is communication with people you may never meet, often in a second language for both sides. That is one reason technical designers write plainly and draw instead of describing. A marked flat crosses a language barrier. A long paragraph often does not.

It also means keeping one version of the truth. When the factory asks whether the buttons on the ecru colourway are navy or ecru, the answer goes into the pack and the revision log, not only into a message thread that nobody will find next season.

When a small label needs one

You may not need a technical designer on staff. You will need the work done. These are the usual signs it is missing:

• Samples come back close to the sketch but not quite, and nobody can say why.
• The factory sends a list of questions after every order.
• Sizes away from the base fit inconsistently.
• Measurements live in emails instead of on a spec sheet.
• Each sample round fixes one thing and changes another.

Each of these usually means a decision was left for the factory to make. The technical designer’s job is to make it first, and write it down.

Where 3D fits

Some technical designers work in 3D, building a virtual sample before anything is cut. It is a way to check proportion, balance and fit decisions early, while changing them takes minutes. It does not replace a physical sample on a body, or the tech pack a factory sews from. It means the first sample in cloth starts from a garment that has already been looked at closely.