This is a reference for navigating the fashion supply chain as a wholesale apparel brand. As brands move from direct-to-consumer (DTC) sales into retail relationships, learning the language of the fashion supply chain becomes essential. This glossary helps your team speak the same language as global retailers’ compliance standards.
For a strategic overview of these concepts, please refer to our earlier article: An Introduction to the Fashion, Apparel, and Footwear Category.
Market and Calendar Terms
In apparel, everything runs on the retail calendar. Fashion runs on tight seasonal windows, and delivery timelines are non-negotiable. Missing a shipping window by even a few days can mean heavy penalties or a canceled order, which is why lining up production with the retail calendar matters so much.
Cancel Date is the last day a retailer will accept a shipment. If suppliers miss it, the buyer can refuse the shipment outright, leaving the supplier with dead stock to sell off at a loss.
Delivery Flow is the strategic, phased movement of goods from the supplier to the retail floor to help keep inventory fresh and prevent warehouse bottlenecks. Proper flow management helps keep the right products on the floor during peak demand periods without overwhelming the retailer’s receiving capacity.
A Line Sheet is a concise sales tool used in wholesale that provides buyers with essential product details, including images, pricing, and available variants. A clear line sheet is the primary driver of purchase orders; errors here can lead to incorrect SKU setups and fulfillment failures later in the cycle.
Market Week is a scheduled period during which brand representatives and retail buyers meet to review new collections and place orders. This is the high-stakes window where a brand’s seasonal revenue is often determined, so operational readiness needs to be in place before it begins.
Open-to-Buy (OTB) is the specific budget a retail buyer has allocated for purchasing inventory in a given period, as detailed in Shopify’s Open To Buy Definition + Formula for Retail Planning. Understanding a buyer’s OTB constraints keeps sales goals aligned with the retailer’s available capital and inventory targets.
Pre-book refers to orders placed by retailers for products before they have entered the production phase. Pre-books give the manufacturer the data needed to forecast production volume, reducing the risk of over-manufacturing and capital tie-up.
Ship Window is the specific timeframe allowed for delivery, bounded by the start ship date and the cancel date. Managing this window requires precise logistics coordination; shipping too early or too late can trigger compliance chargebacks and affect the vendor scorecard.
Start Ship Date is the earliest possible date a carrier is authorized to pick up goods from a supplier for a specific order. Shipping before this date can disrupt the retailer’s warehouse receiving schedule and lead to penalties or immediate shipment refusal.
While the retail calendar dictates the timebound nature of a partnership, the complexity of apparel data dictates the operational requirements for fulfillment.
Related Reading: Why Fashion Runs On A Calendar (and What It Costs Suppliers Who Fall Behind It)
Product and Merchandising Terms
Apparel item data is inherently more complex than general merchandise because a single style frequently translates into dozens of unique SKUs. A single T-shirt design can multiply into 30 or more variants across various color and size combinations. Managing this data requires absolute precision so the physical product matches the digital record in the retailer’s ERP and POS systems.
Carryover refers to core products that remain in the brand’s line across multiple seasons rather than being phased out. Carryovers provide stable revenue and more predictable inventory management compared to high-risk seasonal fashion, allowing for safer stock-building.
Colorway is a specific color or pattern variation of a particular garment style. Every colorway requires a unique identifier at the GTIN level; confusing these during fulfillment leads to incorrect shipments and higher consumer return rates.
Core vs. Seasonal distinguishes evergreen basics, called core, from fashion items with a limited lifespan tied to trend cycles, called seasonal. Balancing this mix is critical for maintaining cash flow while driving consumer interest through newness, and retailers often prioritize open-to-buy dollars toward seasonal items.
Floor-Ready describes merchandise that arrives at the retailer with all price tags, UPC labels, and hangers already applied, per the standards in What Is Floor-Ready Merchandise? A Guide to Apparel Retail Compliance. Meeting floor-ready standards reduces labor costs for retailers but increases pressure on the supplier’s warehouse; falling short leads to compliance deductions.
Garment on Hanger (GOH) is a shipping method where garments are transported on hangers rather than folded in cartons. GOH reduces prep time at the store level but requires specialized logistics handling and equipment in the supplier’s distribution center.
Musical Run refers to a non-standard or varied distribution of sizes within a shipment or prepack to meet localized demand. Suppliers need to track these runs with high precision so size availability matches the retailer’s regional size curves.
NRF Size/Color Codes are standardized numeric codes established by the National Retail Federation to keep terminology consistent across the industry. Major retailers require these codes so that terms like Navy or Large are searchable and consistent for consumers across brands.
Prepack is a fixed assortment of various sizes and colors contained within a single shipping carton. Prepacks simplify store-level replenishment but require rigorous picking accuracy from the supplier to avoid inventory distortion at the SKU level.
Size Curve is the specific ratio of sizes ordered based on expected demand. Miscalculating the size curve leads to stockouts of popular sizes and excessive markdowns on others, which hurts the style’s overall GMROI.
SKU, or Stock Keeping Unit, is the unique identifier assigned to every distinct variant of a product across size, color, and style, as explained in GS1 Standards for New Suppliers: GTINs, UPCs, and Case Codes. It’s the foundational unit of inventory, so errors in SKU management ripple through fulfillment and billing.
Style Number is the identifier used for a base design before specific size and color variants are assigned, distinct from the SKU and UPC levels covered in GS1 Standards for New Suppliers: GTINs, UPCs, and Case Codes. Style numbers let designers and buyers communicate aesthetic design before moving into the granular SKU level required for execution.Related Reading: How Size Curves and Pack Configurations Improve Inventory Performance
Money Terms
Retail math is the language of inventory productivity. Retailers view a supplier’s success through the lens of how much profit is generated for every dollar invested in stock. Understanding these metrics is essential for negotiating wholesale contracts and proving a brand’s value to a buyer.
Allowance is a pre-negotiated discount or credit provided by the supplier to cover costs like advertising or damages, distinct from a deduction taken for an error, per Understanding Retailer Deductions, Chargebacks, and Fines. Allowances need to be factored into wholesale pricing so net margins stay sustainable after these pre-agreed deductions are taken.
AUR, or Average Unit Retail, is the average price an item is sold for after all markdowns and discounts. If the AUR runs significantly below the original retail price, it signals the product only moves when discounted, which can hurt brand equity and weaken the brand’s position in future wholesale negotiations.
GMROI, or Gross Margin Return on Investment, measures inventory productivity as gross profit divided by average inventory cost. A high GMROI signals efficient capital use, making the brand more attractive for reorders.
Inventory Turns counts how many times inventory is sold and replaced in a year. High turns indicate strong demand and efficient stock management, while low turns suggest the supplier’s capital is trapped in slow-moving goods.
Markdown is a permanent reduction in retail price to accelerate sales or clear remaining seasonal inventory, one of the deduction types covered in Understanding Retailer Deductions, Chargebacks, and Fines. Frequent markdowns can signal that initial pricing was too high or that the product isn’t resonating with the retailer’s customer base.
Markdown Money is a payment from the supplier to the retailer to offset lost margin when a product is discounted to clear the floor, also covered in Understanding Retailer Deductions, Chargebacks, and Fines. It’s a structural cost in many apparel relationships, and failing to budget for it can turn a seemingly profitable order into a net loss.
Sell-Through Rate is the percentage of units sold to the end consumer compared to the total inventory received by the retailer, as explained in Shopify’s sell-through rate guide. It’s a primary indicator of consumer demand, and a high sell-through rate gives a supplier its strongest position during reorder and price negotiations.
Weeks of Supply calculates how long current inventory will last at current sales rates. Both retailer and supplier use it to decide when to trigger a reorder or when to plan for defensive markdowns that keep delivery flow on track.
Financial performance is dictated by these numbers, but it is executed through various channels and fulfillment models.
Regulatory Terms
The following definitions are provided for descriptive purposes only and do not constitute legal advice. Suppliers should consult with legal counsel for specific compliance requirements.
In recent years, the regulatory environment for apparel has shifted toward greater transparency and traceability. Failure to comply with these standards can lead to seizure of goods at the border or legal penalties.
Care Label refers to the mandatory instructions permanently attached to a garment providing guidance for washing and maintenance, per the FTC’s Threading Your Way Through the Labeling Requirements Under the Textile and Wool Acts. Inaccurate labeling can lead to consumer complaints and legal penalties.
Country of Origin is the legal disclosure of where an item was manufactured, governed by the same FTC labeling rules alongside Customs requirements. Incorrect country of origin labeling is a major cause of customs delays and can result in fines or mandatory product recalls.
Digital Product Passport is an upcoming EU mandate that will require products to carry digital sustainability and lifecycle data. New EU Rules on Unsold Textiles: Destruction Ban and Compliance covers this alongside the related unsold-textiles rules. The destruction ban for unsold apparel starts for large companies in July 2026. The specific Digital Product Passport requirements for textiles aren’t final yet, but brands should still plan for the data investment.
EPR, or Extended Producer Responsibility, requires brands to manage the end-of-life disposal or recycling of their products, part of the same EU policy direction covered in New EU Rules to Stop Destruction of Unsold Clothes and Shoes. It shifts the cost of waste from government to brand, requiring a financial strategy for a product’s end-of-life and circularity.
RN Number is the Registered Identification Number the FTC assigns to US-based textile businesses, which can be printed on a label in place of the company’s full legal name. It’s a foundational requirement for identifying the responsible party on labels in the US wholesale market.
UFLPA, the Uyghur Forced Labor Prevention Act, is a US law. It creates a rebuttable presumption that goods connected to Xinjiang were made with forced labor, covered in more depth in Fashion Supply Chain Traceability, and Why Documentation Matters More Than Ever. The importer carries the burden of proof to document the supply chain. Failing to rebut the presumption risks seizure of goods at the border by CBP.
Success in the modern apparel market requires more than high-quality design. It requires operational readiness and a working understanding of these professional standards. For more on how these terms fit into the category as a whole, visit An Introduction to the Fashion, Apparel, and Footwear Category or check out more at The Supply Chain Source.