Educational guide
What is PLM in fashion, and when does a brand need it?
PLM, short for product lifecycle management, is the system a fashion brand uses to develop a product, from the first sketch to the approved tech pack. It holds the design, materials, colourways, bill of materials, size specification, samples, costs and suppliers for every style, on one record. Production starts from that record.
4 min read · Updated 23 October 2026
PLM is where the product is made, before it is sold.
Most retail systems start when something has been bought: a purchase order, a delivery, a sale. PLM covers everything before that. Design, development, sampling, costing and sourcing all happen in PLM, and the output is a style that is ready to buy.
What a fashion PLM holds.
- design boards, themes and references for the season
- colourways and lab dips, with the approved standard
- materials and trims, with composition and supplier
- the bill of materials, by colourway
- the size specification, graded across the run
- the tech pack: construction details, how to measure, packaging and labelling, sewing instructions and technical flats
- samples and fit rounds, with comments against the spec
- costs, rolled up to landed cost and the gap to target price
- suppliers, quotes and the award, with the reason
- milestones on a critical path, from development to delivery
PLM, ERP, PIM and planning do different jobs.
| System | Its job | Starts when |
|---|---|---|
| PLM | Develop the product: design, spec, samples, cost and suppliers | The first sketch |
| Planning | Decide how much to buy and where it goes: budget, MFP (WSSI), OTB, range and option plan | Before the season |
| PIM | Describe the product for selling: attributes, copy, images and channel content | The style is approved |
| ERP | Record the transactions: purchase orders, stock, receiving, invoices and finance | The purchase order is raised |
They meet at the edges. The approved style in PLM becomes the option in the range plan, the product record in PIM and the SKU in the ERP. When these are separate systems, someone retypes the style at every step.
Signs a brand has outgrown spreadsheets.
- More than one version of a tech pack is in circulation.
- Fit comments live in email, not against the spec.
- Nobody can say which samples are late without asking.
- Costs are rebuilt in a separate workbook for every style.
- Supplier quotes are compared by eye.
- Approved styles are retyped into the planning file and the ERP.
What to look for in a fashion PLM.
- Revisions that freeze at sign-off, with who signed and when.
- A tech pack exported from the record, not edited as a PDF.
- Fit checked against the frozen spec at the smallest, base and largest size.
- Costing by colourway, through to landed cost and the target-price gap.
- Quotes that compete on the same criteria, with the award recorded.
- A critical path that shows late samples while there is still time to act.
- A link to planning and the ERP, so approved styles are never retyped.
In merchmix, forge is the PLM.
forge keeps design, materials, colourways, BOM, samples, suppliers, specs and the tech pack on one record, from concept to sign-off. BOM revisions freeze once signed off, and the tech pack exports as one PDF from the frozen revision. When a style is approved, it becomes the range option in core, in seconds. The same record holds the product information that goes to Shopify. Your ERP stays the system of record: run horizon, or connect NetSuite, SAP S/4HANA or Microsoft Dynamics 365. 1/10 the cost of enterprise suites, live in 12 to 15 weeks.
- What is assortment planning?
- Breadth, depth and store clusters. Read the guide
- What is a WSSI?
- How the weekly MFP (WSSI) plan tracks stock and intake. Read the guide
- How do you manage samples and tech packs without spreadsheets?
- How fashion brands run samples and tech packs on one record instead of a tracker, a PDF folder and an inbox. Read the guide
See if this fits the way you already work.
Questions, answered.
What does PLM stand for?
Product lifecycle management. In fashion, it covers a product from the first sketch to the approved tech pack and into production.
What is the difference between PLM and ERP?
PLM develops the product. ERP records the transactions once it is bought: purchase orders, stock, receiving, invoices and finance.
What is the difference between PLM and PIM?
PLM holds what it takes to make the product. PIM holds what it takes to sell it: attributes, copy, images and channel content. In merchmix, both sit on the same product record.
When does a fashion brand need a PLM?
When several people and suppliers work on the same styles and the spreadsheet stops being the single version. The usual signs are tech pack versions drifting, fit comments lost in email and samples running late without anyone noticing.
How long does it take to move to a PLM?
merchmix is live in 12 to 15 weeks, end to end. It starts with a free six-week proof of concept on your own data, no contract.
Signals matter while there is time to act.
Let us show you how merchmix keeps teams trading instead of firefighting.