One folder, in the order
a factory reads it.
No dashboard to log into, no format only Seamix can open. A run finishes and you download a ZIP: a print-ready PDF, every drawing at full resolution, and the raw data behind it. Below is a real one — CJ‑001, a boxy chore jacket — with its actual numbers, not a sample.
Three things, and you own all of them.
A4 portrait, seven sections, page numbered, with your brand on every footer. This is the document you send on once you are happy with it, laid out the way a tech pack is laid out so nobody has to hunt for anything.
Every drawing the run produced, as its own full-resolution image. Drop them into a line sheet, a range plan or a supplier email without screenshotting a PDF.
The whole pack as structured data — every measurement, every material line, every construction parameter. For anyone who wants to pull it into their own system.
Downloading is free and always has been, on every paid plan. You pay to make a pack, not to keep it.
Seven sections. Every paid plan gets all of them.
Nothing is held back for a higher tier. The order below is the order the pages are written, and it follows how a factory actually works through a pack: what is this, what does it look like, how is it built, what is it made of, what size is it, how do we sew it.
Master Style Identity
The cover. Style number, brand, season, release version and the date it was issued, next to the primary visual. A factory opening the file knows in two seconds which garment this is and which revision they are holding.
The measurement chart, for real.
This is CJ‑001’s actual registry as the Studio produced it. 22 points of measure, across 5 sizes, every value in centimetres with the garment measured flat, and a tolerance on each row telling the factory how much it is allowed to be out by. Pick a size to read the pack the way a sampling room would.
| Code | Point of measure | XS | S | M | L | XL | Tol |
|---|---|---|---|---|---|---|---|
| M01 | Centre back length from HPS | 44.0 | 45.0 | 46.0 | 47.2 | 48.4 | ±1.0 |
| M02 | Centre front length from HPS | 44.0 | 45.0 | 46.0 | 47.2 | 48.4 | ±1.0 |
| M03 | Chest width 2.5cm below armhole | 55.0 | 57.0 | 59.0 | 62.0 | 65.0 | ±1.0 |
| M04 | Waist width at natural waist | 55.0 | 57.0 | 59.0 | 62.0 | 65.0 | ±1.0 |
| M05 | Hem width | 61.0 | 63.0 | 65.0 | 68.0 | 71.0 | ±1.0 |
| M06 | Cross shoulder point to point | 49.5 | 50.5 | 51.5 | 53.0 | 54.5 | ±0.5 |
| M07 | Cross front 15cm below HPS | 35.1 | 35.9 | 36.6 | 37.6 | 38.7 | ±0.5 |
| M08 | Cross back 15cm below HPS | 37.1 | 37.9 | 38.6 | 39.8 | 40.9 | ±0.5 |
| M09 | Neck width seam to seam | 18.4 | 18.7 | 19.0 | 19.4 | 19.8 | ±0.5 |
| M10 | Front neck drop | 9.0 | 9.0 | 9.0 | 9.0 | 9.0 | ±0.3 |
| M11 | Back neck drop | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 | ±0.3 |
| M12 | Armhole drop from HPS | 31.8 | 32.2 | 32.5 | 32.9 | 33.3 | ±0.5 |
| M13 | Armhole girth on the curve | 65.2 | 65.9 | 66.6 | 67.5 | 68.3 | ±1.0 |
| M14 | Sleeve length from shoulder point | 48.7 | 49.5 | 50.3 | 51.1 | 52.0 | ±1.0 |
| M15 | Bicep width 2.5cm below armhole | 20.7 | 21.0 | 21.2 | 21.5 | 21.7 | ±0.5 |
| M16 | Elbow width | 17.4 | 17.6 | 17.8 | 18.0 | 18.3 | ±0.5 |
| M17 | Cuff or sleeve opening width | 12.0 | 12.2 | 12.3 | 12.4 | 12.6 | ±0.3 |
| M18 | Sleeve head girth on the curve | 65.2 | 65.9 | 66.6 | 67.5 | 68.3 | ±1.0 |
| M34 | Collar height centre back | 7.0 | 7.0 | 7.0 | 7.0 | 7.0 | ±0.3 |
| M36 | Placket width | 3.2 | 3.2 | 3.2 | 3.2 | 3.2 | ±0.2 |
| M37 | Pocket opening length | 16.8 | 16.8 | 16.8 | 16.8 | 16.8 | ±0.3 |
| M38 | Pocket placement from HPS | 36.0 | 37.0 | 38.0 | 39.2 | 40.4 | ±0.5 |
Everything the jacket is made of.
28 lines across 5 groups. Every panel that gets cut, every snap that gets set, the thread, the labels and the polybag — each with the quantity one jacket consumes at size M. In the PDF each line carries its own rendered swatch.
| Ref | Component | Specification | Qty |
|---|---|---|---|
| Body fabric · 12oz cotton canvas duck, deep olive · 15 lines | |||
| B01 | Front panels | Main body, left and right | 0.45 m |
| B02 | Back panel | With twin darts | 0.40 m |
| B03 | Back yoke | Upper back shoulder yoke | 0.10 m |
| B04 | Upper sleeves | Top of two-piece sleeve | 0.30 m |
| B05 | Under sleeves | Bottom of two-piece sleeve | 0.20 m |
| B06 | Collar | Top and under collar | 0.10 m |
| B07 | Chin strap | Concealed throat latch | 0.02 m |
| B08 | Chest pockets | Bellows style | 0.08 m |
| B09 | Chest pocket flaps | Angled | 0.04 m |
| B10 | Hip pockets | Large patch | 0.10 m |
| B11 | Front placket | Reinforced CF closure facing | 0.05 m |
| B12 | Cuffs | Single-snap | 0.04 m |
| B13 | Pen slot | Small patch pocket | 0.01 m |
| B14 | Hanging loop | Interior neck loop | 0.01 m |
| B15 | Internal backing patches | Cut from fallout | from fallout |
| Hardware · matte-black YKK ring snaps, brass · 4 lines | |||
| H01 | CF placket snaps | Matte-black YKK ring snap | 5 |
| H02 | Cuff snaps | Matte-black YKK ring snap | 2 |
| H03 | Chest flap snaps | Concealed | 2 |
| H04 | Chin strap snap | Concealed | 1 |
| Thread · 100% polyester core-spun · 2 lines | |||
| T01 | Topstitching thread | Heavy duty construction, Tex 60 | 150.00 m |
| T02 | Bobbin thread | Standard | 100.00 m |
| Labels · 100% polyester woven · 3 lines | |||
| L01 | Main brand label | High-density woven damask | 1 |
| L02 | Size label | Alpha size, taffeta | 1 |
| L03 | Care label | Wash and content, printed satin | 1 |
| Packaging · 4 lines | |||
| P01 | Polybag | Clear LDPE garment bag | 1 |
| P02 | Hangtag | Recycled cardstock | 1 |
| P03 | Hangtag pin | Waxed cotton cord and safety pin | 1 |
| P04 | Desiccant | Silica gel, inside polybag | 1 |
Every size in the run, from one brief.
A size run is not a percentage applied to a base. Each measurement grows by its own rule — a chest by centimetres, a neck by millimetres, a front neck drop not at all. These are the runs the engine drafts, with the base size highlighted.
Footwear charts print UK equivalents alongside the EU sizes, so a UK sampling room does not have to convert anything by hand.
A pack with a hole in it cannot be downloaded.
Every finished run gets a verdict, computed from what actually happened rather than stamped on. Two of the four let you download. The other two tell you exactly what is wrong first — which is the entire point, because a factory finding it instead of you is expensive.
Nothing blocking, nothing to note.
Download unlockedNothing blocking. Some advisories worth reading before you send it.
Download unlockedAt least one blocking problem, listed in full so you can correct the brief and run it again.
Download heldA required view could not be produced. The pack says so on its face.
Download heldEvery pack also prints its own audit: how many measurements were computed and on which engine version, whose body they were drafted from, the size run and base size, how many rules were evaluated and how many blocked, and how many of the drawings came back with findings. You can check every line of it against the pack in front of you.
What is not in the folder.
No pattern files
There is no DXF and no AI file in the ZIP. Seamix gives you the drawings and the measurements — it does not output a digital pattern your CAD system can open. If that is what you need, this is not yet the tool for it.
No editable spreadsheet
The measurement chart and the bill of materials come as PDF and as JSON, not as an XLSX you can type into. The JSON has everything in it, so a spreadsheet is a conversion away — but we do not do that conversion for you today.
No prices
The bill of materials carries a cost column, and Seamix leaves it for your supplier. Nobody can tell you what 12oz canvas costs at your quantity, from your mill, this month, except the people quoting it.
Not a finished production spec
It is a draft for a technologist to read. The drawings are flat and the stitch notes use the numbers factories already know, but fit still has to be confirmed on a real sample against your own blocks. Anyone telling you otherwise is selling you something.
Make one and open the folder.
Your first pack is free, no card. Download it, read every page, and decide for yourself.