How to Identify Garment Maker Codes on Clothing Labels

Ever flipped through the tag on a shirt and wondered what all those numbers and codes actually mean? If you've ever tried to figure out who made a piece of clothing, track down a brand's origin, or authenticate a vintage find, learning how to identify garment maker codes on clothing labels is a skill worth having. These small printed details hold real information about the manufacturer, the country of production, and sometimes even the specific factory involved. For resellers, thrift shoppers, collectors, and anyone curious about where their clothes come from, these codes are the starting point.

What Are Garment Maker Codes on Clothing Labels?

Garment maker codes are identification numbers or letter sequences printed on clothing labels that point back to the company responsible for manufacturing or importing the garment. The most common type is the RN number (Registered Identification Number), issued by the Federal Trade Commission in the United States. An RN number is assigned to a business that manufactures, imports, distributes, or sells textile products, and it lets anyone look up that company in a public database.

Beyond RN numbers, you may also see CA numbers (used in Canada), WPL numbers (older U.S. wool product labels), or proprietary manufacturer codes that brands stamp onto their tags. Each serves the same basic purpose: connecting the garment back to the entity that put it on the market.

Where Exactly on a Clothing Label Can You Find These Codes?

Maker codes typically appear on the main brand label (usually sewn into the neckline or waistband) or on the care label (the one with washing instructions). Look for short strings of numbers, often preceded by letters like "RN," "CA," or "WPL." They're usually printed in small text near the bottom of the label, close to the country-of-origin statement or fiber content information.

Here's where to check specifically:

Neck label: The brand tag most often carries the RN number alongside the brand name.
Care/content label: Sometimes the RN or manufacturer code appears here instead, especially on items where the brand label is minimal.
Side seam label: On some garments, additional manufacturer information is printed on a separate tag along the side seam.
Hang tag: Occasionally, maker identification appears on a removable hang tag rather than a sewn-in label.

How Do You Read an RN Number and Look Up the Manufacturer?

An RN number is usually a five-digit number (older ones can be shorter). If you see "RN 12345" on a label, that number is registered to a specific company. You can enter it into the FTC's public RN lookup database to find the company name and address. This works for both modern clothing and older garments, though some very old companies may no longer be in the system.

The process is straightforward:

Find the RN number on the garment label.
Go to the FTC's online RN database.
Enter the number and search.
Review the registered company name, city, and state.

For vintage clothing specifically, RN numbers can be a powerful authentication tool. The number on a garment should match a company that was operating during the era the piece claims to be from. You can dig deeper into this process by learning about RN number lookups for vintage clothing authentication.

What Do Other Codes on Clothing Labels Mean?

Aside from RN numbers, clothing labels carry several other types of information. Understanding them helps you get the full picture of a garment's background.

CA number: The Canadian equivalent of an RN. Assigned by Competition Bureau Canada to companies selling textile products in Canada.
WPL number: An older U.S. numbering system used before the RN system expanded. You'll find these on garments from roughly the 1950s and earlier.
Country of origin: A legally required statement indicating where the garment was made or assembled.
Fiber content: Lists the materials used (e.g., 100% cotton, 60% polyester/40% cotton).
Style or lot numbers: Manufacturer-specific codes that identify a particular product line or production batch. These aren't standardized and vary widely between brands.

Some countries outside the U.S. and Canada use their own systems for manufacturer identification. If you're trying to identify a garment made overseas, it helps to use a database organized by country to narrow down the maker.

Why Would You Need to Identify a Garment Maker Code?

There are several practical reasons someone might want to trace a garment back to its maker:

Authenticating vintage or secondhand clothing. A correct RN number matching the right time period helps confirm a piece is genuine, not a modern reproduction.
Identifying the brand on unbranded or relabeled items. Thrift store finds sometimes have the original brand label cut out, but the RN number on the care label remains.
Product safety and recalls. If a garment is part of a recall, the manufacturer code helps you confirm whether your item is affected.
Sourcing and wholesale inquiries. Resellers or boutique owners sometimes use maker codes to track down suppliers.
Researching garment quality. Knowing who actually made a piece versus whose name is on the label can reveal a lot about construction and material quality.

What Are the Most Common Mistakes People Make With Label Codes?

A few pitfalls trip people up regularly:

Confusing style numbers with RN numbers. Style numbers are product-specific and don't identify the manufacturer. An RN number is always tied to a registered company.
Assuming the brand name is the manufacturer. Many brands outsource production. The company on the RN registration may be an importer, not the brand itself.
Overlooking older numbering systems. WPL numbers and early RN numbers predate digital databases. Some won't show up in the current FTC lookup, which can lead people to think the code is fake when it's simply outdated.
Ignoring the country of origin context. A garment labeled "Made in [country]" tells you where it was assembled, but the manufacturer (the RN holder) might be based somewhere else entirely.
Not checking multiple labels. The maker code might be on the care label rather than the brand tag, or vice versa. Check every label in the garment.

Useful Tips for Identifying Maker Codes More Easily

With practice, reading garment labels becomes second nature. Here are some things that help:

Use good lighting and a magnifier. Label text is often very small. A phone camera with zoom can work in a pinch.
Take a photo before searching. Snap a picture of the label so you can type the code accurately later instead of relying on memory.
Bookmark the FTC RN lookup tool. You'll use it more often than you think once you start paying attention to labels.
Cross-reference with other label details. If the RN number points to a company based in New York but the label says "Made in Italy," that's normal the company may be an importer. Understanding typography on labels can also help you spot inconsistencies. Labels produced with clean, professional typefaces like Garamond tend to be from established manufacturers, while poor printing quality or unusual fonts can sometimes signal counterfeits.
Learn the difference between importer labels and manufacturer labels. In the U.S., the company identified on the label is the one legally responsible for the product, whether they made it or imported it.

For a full walkthrough of the label-reading process, our guide on how to identify garment maker codes on clothing labels covers the details step by step.

Quick Checklist for Identifying Any Garment Maker Code

Next time you pick up a garment and want to trace its maker, run through this list:

Check every label in the garment neck, care tag, side seam, and hang tag.
Look for any code starting with RN, CA, or WPL followed by numbers.
Note the country of origin and any style or lot numbers printed nearby.
Enter the RN or CA number into the appropriate government lookup database.
Cross-check the result against the brand name, country of origin, and the garment's apparent age.
If the number doesn't show up, consider that it may be an older WPL number or a code from a non-U.S./non-Canadian system.
Document what you find take a photo or write it down for future reference.