In this article, learn about:
The four types of metrics fashion suppliers should track
Why apparel metrics can look healthy at the total-business level while hiding problems by size, store, or style
The five metrics a small fashion brand should track first
If you sell to retailers, you already have access to a lot of data: units shipped, units sold, inventory on hand, fill rate, chargebacks, and more. But for most brands, having access to information isn’t an issue, it’s knowing what to do with it. What numbers are useful? What needs to change?
The most useful fashion supplier metrics fall into four areas: sales performance, inventory, compliance, and deductions.
Category | Key metrics | How often to review | What it can tell you |
Sales | Sell-through rate, full-price sell-through, markdown rate, AUR | Weekly | Whether products are selling at the expected rate and price |
Inventory | Turns, weeks of supply, GMROI | Monthly | Whether inventory is generating enough sales and margin |
Compliance | Fill rate, on-time percentage, ASN accuracy, vendor scorecard | Every shipment | Whether orders are being fulfilled according to retailer requirements |
Deductions | Deduction rate, returns rate, dispute recovery rate | Monthly | How much revenue is being lost and whether problems are being recovered |
The right level of detail matters, too. For apparel, look at performance by style, color, size, and week when the data is available. A chain-wide average can hide problems that are already affecting sales or inventory.
Which Metrics Show Whether a Style is Selling?
Sell-through rate is one of the most useful metrics for an apparel brand. It measures the percentage of received units that have sold.
Sell-through rate = Units sold ÷ Units received × 100
Review sell-through data weekly during the selling season. Looking at sell-through by style and size can show problems that aren't visible in an overall average.
For example, a style might have a 65% sell-through rate overall, but that number doesn't tell you whether the remaining inventory is spread evenly across sizes or concentrated in a few slow-moving ones.
A seasonal sell-through rate of 60% to 80% by the end of the season is sometimes used as a general benchmark, but there is no universal target. The right number depends on the category, price point, retailer, and selling season.
Two other metrics add context:
Full-price sell-through: How much product sold without a markdown
Markdown rate: How much of the assortment required price reductions
Average unit retail (AUR): The average price at which units are selling
Taken together, these numbers show whether a product is selling at the expected pace and at the expected price. Then, brands can decide if a fast-selling style needs a reorder, or if a slow-selling style may need a markdown.
Related Reading: How Size Curves and Pack Configurations Improve Inventory Performance
How Fashion Brands Measure Inventory Performance
Inventory turns measure how many times a business sells and replaces its inventory over a year.
Inventory turns = Cost of goods sold ÷ Average inventory
Apparel businesses often see roughly four to six inventory turns per year, although the appropriate rate varies considerably by business model and product category. Weeks of supply is another useful way to look at inventory, as it estimates how long current inventory will last based on recent sales.
Weeks of supply = On-hand units ÷ Average weekly unit sales
This can be particularly useful during a selling season. If a style has 12 weeks of supply, but the season has only six weeks remaining, the business may need to adjust its plans.
What is GMROI?
GMROI (gross margin return on inventory investment) looks at both inventory investment and gross margin.
GMROI = Gross margin dollars ÷ Average inventory cost
In simple terms, it answers a useful question: How much gross margin are you generating for every dollar invested in inventory?
Published industry research commonly puts apparel GMROI somewhere around $1.86 to $3.00, but these figures should be treated as directional rather than as a standard every brand should meet.
GMROI is most useful when you track it over time and compare similar products. A declining GMROI can indicate that inventory is moving more slowly, margins are falling, or both.
That gives merchandising and finance teams a reason to look more closely at the assortment before the problem gets larger.
Related Reading: What Is Gross Margin Return on Inventory Investment?
How Fashion Brands Should Track for Retailer Performance
Retailers track how well suppliers follow their shipping and order requirements. Some of the most common metrics are:
Fill rate: How much of the order you shipped
On-time percentage: How often you shipped or delivered within the required time
ASN accuracy: Whether the advance ship notice (ASN) matches what you actually shipped
Vendor scorecard: The retailer's overall rating of your performance
These numbers matter because poor performance can lead to chargebacks, lower vendor ratings, and fewer orders from the retailer.
Tracking these metrics can also help you find problems in your own operations. If your fill rate is low, for example, you can look at which products, warehouses, or retailers are causing the issue and fix the problem.
Related Reading: How to Build an Effective Supplier Scorecard
How Much Revenue Are Deductions Taking From Your Business?
Retailer deductions can take a meaningful amount of revenue out of a supplier's sales. Three metrics help show the size of the problem and whether you're doing anything about it.
Deduction rate measures deductions as a percentage of sales.
Deduction rate = Total deductions ÷ Total sales × 100
Returns rate measures the percentage of sales or units that are returned.
Dispute recovery rate measures how much of the amount you dispute is ultimately recovered.
A high deduction rate tells you that a significant amount of revenue is being withheld, while a low dispute recovery rate may indicate that you're not recovering money you could potentially claim. A recurring deduction reason can point to an operational problem that needs to be fixed.
For example, if a retailer repeatedly deducts for routing violations, the answer isn't simply to dispute each deduction. It's worth investigating why the violations keep happening and whether the shipping process needs to change.
This is where deduction data becomes more useful than a list of individual chargebacks. Looking at patterns can help you separate one-off errors from problems that are costing the business month after month.
Which Five Metrics Should a Small Fashion Brand Track First?
Luckily, five metrics can provide a useful view of sales, inventory, compliance, and revenue loss:
1. Weekly sell-through by style and size
2. Weeks of supply
3. Fill rate
4. On-time percentage
5. Deduction rate
These metrics can usually be calculated from information a brand already has in retailer portals, shipment records, inventory systems, and accounting records.
As the business grows, add more detail rather than simply adding more metrics. Start with the total business, then break performance down by retailer, door, style, color, size, or week to find the areas that need attention.
Frequently Asked Questions
What is a good sell-through rate for apparel?
A commonly cited directional benchmark is 60% to 80% by the end of the season, but the right target varies by category, price point, retailer, and season. Review sell-through weekly and, when possible, by style and size.
How do you calculate GMROI?
GMROI is calculated by dividing gross margin dollars by average inventory cost. Published apparel benchmarks often fall somewhere around $1.86 to $3.00, but these should be treated as directional figures rather than universal targets.
What's a typical inventory turn rate for fashion brands?
Apparel businesses often see roughly four to six inventory turns per year. The appropriate rate depends on the business and assortment. Because turns are calculated over a longer period, weekly sell-through and weeks of supply can provide earlier insight during a selling season.
Why can aggregate metrics be misleading for apparel?
A style can have a healthy overall sell-through rate while individual sizes or stores are under- or overstocked. Breaking the data down by style, size, door, and week can reveal problems that aren't visible in the overall number.
The benchmark figures cited in this article are directional industry estimates from published secondary sources, not SPS Commerce network data, and should be used for general orientation rather than as fixed standards.
See Your Fashion Metrics in One Place
Most of the metrics above come from data scattered across retailer portals, spreadsheets, and your own accounting system. SPS Commerce Analytics pulls your sell-through, inventory, and item-level data into one place, by size, by door, by week, so you're not assembling it by hand every time you need to check it.
Not ready for a full analytics setup? The Supply Chain Source has more resources on supplier metrics and retailer compliance to help you get started.