What the label must carry in the US
For garments entering or sold in the United States, the Textile Fiber Products Identification Act defines the mandatory content of the fiber label. Three elements do most of the work: the generic names and percentages by weight of the constituent fibers; the country of origin; and the registered identification number - the RN number - that identifies the company responsible for the product in place of printing a full business name on every label. The system is administered by the Federal Trade Commission, and marketplace and retail compliance teams check it carefully, because a label defect is one of the few garment faults that can hold a shipment at entry rather than merely annoy a customer. For intimates the stakes are ordinary but the geometry is unhelpful: the label has to carry all of this on a small strip inside a small garment.
Fiber names and percentages
Fibers are declared by their generic names - cotton, modal, nylon, polyester, elastane - rather than by trade names, and each is declared with its percentage by weight. The percentages come from the bill of materials, which is why the desk asks partner plants to state fabric and trim composition in writing during sampling: a lace with an unstated elastane content, a gusset lining that differs from the body fabric, or a substituted elastic all change the declared values. Decorative trims have their own conventions inside the act, and the labeling vendor or the testing laboratory confirms how a given construction is calculated before the labels are printed, not after a reviewer asks. The written confirmation of composition belongs in the program file next to the artwork approval, so the label can always be traced back to the materials it describes.
Country of origin and the RN number
Origin on a US label states where the product was made, and for imported garments the answer follows the manufacturing story rather than the shipping route: goods cut and sewn in China and shipped onward from a regional hub are still labeled by where they were manufactured. The RN number is the quiet workhorse of the label. A company registers once, receives a number, and prints it on every label, which keeps a long legal name off a small satin strip. Importers typically register their own number or use the number of the company responsible under the act, and which arrangement applies is confirmed per program with the labeling vendor. The number also gives reviewers a trail: it identifies a real registrant in a public system, which is why its absence, or a number that resolves to nobody, reads as carelessness and invites a deeper look at the whole pack.
The EU approach to composition
The European Union requires fiber composition on textile product labels as well, declared in percentages under the EU textile labeling framework with its own conventions for fiber names and for how decorative elements are treated. Two practical differences matter to a program shipping into both markets. First, language: composition information is expected to be available in the language or languages of the destination market, and the working practice is to confirm the expectation per destination with the customs broker rather than assume one layout fits the whole Union. Second, identification and origin: the EU does not run a US-style RN system, and origin marking practice differs from the US arrangement, so the same garment can legitimately carry different label layouts for the two destinations. Substance paperwork - REACH - travels separately and is covered in the note on REACH for exporters.
US and EU side by side
| Label element | United States | European Union |
|---|---|---|
| Fiber content | Generic names with percentages under the Textile Fiber Products Identification Act | Percentages under the EU textile labeling framework, with EU fiber naming conventions |
| Origin | Required on the label; follows where the product was made | Practice differs from the US arrangement; confirm per destination with the customs broker |
| Business identifier | RN number identifying the responsible company | No US-style RN system; identification follows market practice |
| Language | English declarations | Destination-market language expectations; confirm per market |
The table is a planning view rather than legal advice: labeling specifics are confirmed with the customs broker and the labeling vendor for each destination before printing, because conventions shift and interpretations can differ by construction. What the table does fix is the workflow - one bill of materials feeding several label layouts, each approved against its own market.
Where the label lives
The content of the label is regulated; its format is a construction decision. Woven satin labels sewn into the center back or side seam remain the default for bras, where the garment already has a stable channel for a label. Printed and heat-transfer labels - the tagless approach - dominate panties, where a sewn label at the waistband reads as roughness against skin. Either format must stay legible through laundering, which makes print method and fabric surface a pairing decision rather than an afterthought; the note on tagless labeling compares the print methods and their wash behavior. The care declaration is a separate statement and usually a separate label or print position, with its own rulebook described in the care note.
Where label programs fail
Most label defects are upstream of the printer. A fabric is substituted after artwork approval and the declared percentages go stale. A trim is dropped for cost and the calculation is never revisited. Origin on the label drifts from origin on the customs entry because two teams answered the question separately. And print that looked sharp on the approval sample fades after three washes because the method did not suit the fabric surface. Each failure is a document failure before it is a print failure, which is why the fix is sequencing - freeze materials, confirm declarations, then print - rather than more inspection at the end.
Setting labels up for a program
- Freeze the bill of materials in writing, with fiber composition per fabric and trim, before label artwork starts.
- Decide the destination set - US, EU, both - because label layout and language follow it.
- Have the labeling vendor or testing laboratory confirm the declared percentages and the trim treatment for each construction.
- Set the RN arrangement for US-bound goods and the identifier approach for other markets.
- Choose format per garment: sewn satin where the construction carries it, tagless printing where skin contact argues against a sewn label.
- Verify printed labels at inspection - content, position and legibility - as a checklist line, not a spot check.
What the program file should hold
Because the label is a document as much as a garment part, the program file keeps the inputs that produced it: the written bill of materials, the vendor confirmation of declared values, the RN registration reference, and artwork approvals per market. When a reviewer asks where a percentage came from, the file answers; when a fabric changes, the file shows exactly which label approvals lapse. Label work slots into the sampling calendar - composition is confirmed with the sample round and artwork approved before bulk - and reference lead ranges sit on MOQ and lead time, confirmed in writing per order. The US import note and the EU import note place the label inside the full entry paperwork.