Educational guide
PLM and PIM for fashion brands: what each does and how they connect
PLM (product lifecycle management) is where a fashion brand develops each style, from first idea to approved product: tech pack, materials, samples, supplier quotes, costing and sign-off. PIM (product information management) takes over once the product is approved, holding the descriptions, images, attributes and channel data needed to sell it on the website, marketplaces and wholesale. Most mid-market brands need both, and the question is where one stops and the other starts.
5 min read · Updated 9 November 2026
What PLM covers.
PLM is where the product team works before anything is bought. Each style has one record, and design, development, sourcing and the supplier all work from it.
- Design. Boards, themes, sketches and colourways for the season.
- Tech pack. Construction, measurements, packaging and labelling: the document the supplier makes the product from.
- Bill of materials. Every fabric, trim, label and packaging component, with quantities and costs.
- Samples and fit. Proto, fit and pre-production samples, with comments against the spec.
- Supplier quotes. Requests for quotation sent to suppliers and compared on the same terms.
- Costing. Costs rolled up to landed cost, with the gap to target price.
- Approval. Sign-off that freezes the spec, so the style is ready to buy.
What comes out of PLM is an approved style: what it is made of, who makes it and what it costs.
What PIM covers.
PIM is where the approved product is prepared for sale. It holds what customers and sales channels see, and keeps it the same everywhere the product is sold.
- Product copy. Titles, descriptions and care details, written for customers.
- Images. Product and on-model shots, in the order each channel shows them.
- Attributes. Fit, fabric, season, occasion and the other filters customers shop by.
- Sizes and colours. The variants on sale, named the way each channel expects.
- Channel-specific data. The fields, categories and rules each website, marketplace and wholesale partner asks for.
- Feeds. The product data sent to the website and marketplaces, kept in step when something changes.
What comes out of PIM is a product that is ready to sell, with the same facts on every channel.
Where they overlap and where they don't.
Most data belongs to one system. A few fields are needed in both.
| Data | Lives in PLM | Lives in PIM |
|---|---|---|
| Style code | Yes, created here | Yes, passed from PLM |
| Materials and composition | Yes, created here | Yes, passed from PLM |
| Measurements | Yes, created here | Yes, passed from PLM for the size guide |
| Costing | Yes | No |
| Supplier | Yes | No |
| Marketing copy | No | Yes |
| Images | Sketches and technical flats | Product and on-model images |
| Channel attributes | No | Yes |
Shared fields are created in PLM and passed to PIM. When they are typed in twice, the two drift apart, and the product page ends up describing a fabric the supplier no longer uses.
How product data flows.
Product data moves one way, from development to sale. Each system adds what it owns and passes the rest on.
- PLM: develop and approve. The style, its materials, costs and supplier are signed off.
- Range plan: decide what to buy and how much. The approved style becomes an option, with a quantity, a price and a place in the budget.
- PIM and ecommerce: sell. The product gets its copy, images and channel data, and goes live.
- ERP: the system of record for orders and stock. Purchase orders, receipts, stock and finance are recorded here.
In practice the steps overlap. The purchase order reaches the ERP once the buy is placed, while the product page is still being prepared. The direction holds: every system starts from the approved style in PLM.
Why planning needs both.
The range plan sits between the two. It needs approved styles and costs from PLM to decide what to buy and what margin to expect. It needs sell-through from the channels PIM feeds to see what is selling and what to buy again.
When the systems are disconnected, styles get re-keyed at every step and the plan works from stale costs. A new price agreed with the supplier never reaches the margin in the plan, and the buy is placed on numbers that are already out of date.
Where forge fits.
forge is the fashion PLM from merchmix. Approved styles move straight into the merchmix range and option plan and can be published to Shopify without being keyed in again, and the ERP stays the system of record.
- What is PLM in fashion?
- The stages a style moves through, from first idea to approved product. Read the guide
- What is assortment planning?
- Breadth, depth and store clusters. Read the guide
- What does retail software need to connect to?
- The commerce, ERP, POS, marketing and analytics systems retail software connects to. Read the guide
- Best PLM software for mid-market fashion brands
- Nine fashion PLMs, who each one suits and what to check before you choose. Read the guide
See if this fits the way you already work.
1-hour demo with sales and product.
Questions, answered.
What is the difference between PLM and PIM?
PLM is where a style is developed and approved: tech pack, samples, suppliers and costing. PIM is where the approved product's selling data lives: copy, images and attributes for each channel. PLM comes first; PIM takes over once the product is ready to sell.
Does a fashion brand need both PLM and PIM?
Most mid-market brands do once they sell through several channels. Smaller brands often start with a PLM and their ecommerce platform's own product data, then add a PIM when channels multiply.
Can PLM replace a PIM?
Not fully. Some PLMs can publish approved products to a platform such as Shopify, which covers simpler set-ups, but a dedicated PIM is built for managing rich channel data at scale.
Where does the ERP fit?
The ERP stays the system of record for orders, stock and finance. PLM and PIM feed it the approved product and its data.
Signals matter while there is time to act.
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