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An RN, or Registered Number, is an identifier assigned by the US Federal Trade Commission to companies involved in making, importing, or selling garments within the United States. It appears on the clothing tag as “RN” followed by five or six digits, typically located near the line detailing fiber content.

The RN is particularly valuable as it remains intact even when the brand tag does not. While a faded or removed brand label offers no information, the RN still reveals the company responsible for the garment. Resellers rely on it to verify a brand prior to listing, and vintage collectors use RN ranges to date items, since lower numbers were issued earlier. The FTC’s public database allows anyone to look up an RN.

Size AI captures the RN automatically along with all other details on the tag, so each processed item keeps a verifiable record of its origin.

The fiber content line is important text on a garment tag. US law mandates its inclusion, buyers use it to search and filter, and all care decisions hinge upon it. However, it is often printed in small typeface, spread across multiple languages, and worn by numerous wash cycles.

Label Scanner handles this by reading the percentages for you: 60% cotton, 40% polyester, with no effort. It also provides a stretch rating on a five-level scale, ranging from rigid to super stretchy, which is significant for fit notes on knits and denim. These figures are organized as structured fields you can edit, export, or directly integrate into a listing.