A garment's label tells you more than who made it. Union labels, country of origin tags, care instructions, and brand-specific typography can pinpoint a piece to within a few years — if you know what to look for.
Labels are the documentary evidence sewn into every garment. Unlike stitching or fabric, which require tactile inspection, labels give you hard data: a union organization's dates of existence, a government-mandated country of origin, a registered number tied to a specific manufacturer and era. When you know how to read these markers, you're not guessing at a garment's age — you're reading its birth certificate.
This guide covers the five most reliable label-based dating methods in order of precision. For a broader overview of vintage authentication beyond labels, see our guide on how to tell if clothing is truly vintage. If you already have a piece and need a fast answer, upload a photo to ThreadLore — the AI reads label details automatically.
Union labels are sewn into American-made clothing and carry specific design histories that allow dating to within 5–10 years. The three major unions to know are the ILGWU (International Ladies' Garment Workers' Union), the ACWA/ACTWU (Amalgamated Clothing Workers of America), and UNITE (their successor).
The ILGWU label went through several distinct designs. The early version — a simple woven tag without a zip code — was used from the union's incorporation through the early 1960s. The version incorporating a zip code appeared after 1963 (the year zip codes were introduced) and ran through 1974. The famous "Look for the Union Label" campaign design, with that distinctive circular logo, was introduced in 1975 and used until the ILGWU merged into UNITE in 1995. Any garment with an ILGWU label was made in the USA between roughly the 1930s and 1995.
| Label | Organization | Date Range |
|---|---|---|
| ILGWU (no zip code) | Ladies' garment workers | ~1900–1963 |
| ILGWU (with zip code) | Ladies' garment workers | 1963–1995 |
| ACWA | Men's clothing workers | 1914–1976 |
| ACTWU | Clothing & textile workers | 1976–1995 |
| UNITE | Combined union | 1995–2004 |
Country of origin labels provide hard date boundaries. The Textile Fiber Products Identification Act of 1960 and subsequent FTC regulations made country of origin disclosure mandatory on garments sold in the US starting in 1971. Any garment without a country of origin label was almost certainly produced and sold before 1971.
Beyond the presence/absence question, specific country names carry date ceilings. "Made in British Hong Kong" predates July 1, 1997 — after the handover, it became simply "Made in Hong Kong." "Made in West Germany" predates German reunification in October 1990. "Made in Czechoslovakia" predates the Czech-Slovak split on January 1, 1993. "Made in Yugoslavia" predates the country's dissolution, roughly 1991–1992. These are absolute ceilings — the garment cannot postdate these events.
Care labels divide vintage clothing history into three clear eras. Pre-1971: no care label required, most garments have none. 1971–late 1990s: written text instructions only ("Machine Wash Warm, Tumble Dry, Do Not Bleach"). Late 1990s–present: international symbol system adopted, often alongside or replacing text.
The FTC's Care Labeling Rule, effective July 3, 1971, was one of the most significant regulatory changes in US clothing history for dating purposes. The complete absence of care instructions — with no evidence a label was removed — is one of the most reliable indicators that a garment predates 1971. Equally, a care label that uses only written English text with no symbols places the garment between 1971 and roughly 1997.
Major heritage brands changed their label designs multiple times, and these changes are well-documented by collectors. Knowing a brand's label history is often the fastest dating method for that brand's pieces.
Levi's: The red tab reads "LEVI'S" in all caps (the "Big E") until 1971 — after which it changed to "Levi's" with a lowercase 'e'. This single detail splits every Levi's garment into pre- or post-1971. The two-horse leather patch transitioned to a paper/cardboard patch in the 1980s. Champion: The reverse weave label with "Champion" in a blue bar with white text dates to the late 1970s–80s. A Champion label with a stylized "C" athletic logo in a plain white tag indicates early 1990s. Nike: The orange tag (1971–1978) is highly sought-after; the transition to the Swoosh label happened around 1978–1979, with "Made in USA" Swoosh labels persisting through the early 1990s.
RN (Registered Number) and WPL (Wool Products Label) numbers are manufacturer identifiers assigned by the FTC. They appear on labels as "RN #XXXXX" or "WPL #XXXXX" and can be looked up in the FTC's public database to identify the exact manufacturer — which in turn helps confirm the garment's era, country of origin, and authenticity.
RN number ranges as rough date proxies: RN numbers below 13,000 were assigned before 1959. Numbers in the 13,000–17,000 range roughly date to the 1960s. Numbers above 17,000 were assigned from the 1970s onward. This is not a precise system — numbers were assigned as manufacturers registered, not on a fixed schedule — but combined with other label evidence it narrows the window significantly.
WPL numbers indicate wool content and were assigned under the Wool Products Labeling Act of 1941. Finding a WPL number means the garment contains wool and was registered under that system — most WPL registrations date to the 1940s through 1970s, as the system was later superseded by the broader RN system.
Cross-reference these label markers when dating a piece. The more columns that align, the more confident the date.
| Era | Care Label | Union Label | Country of Origin | RN Range (approx.) |
|---|---|---|---|---|
| Pre-1960 | None | ILGWU (no zip), ACWA | Often absent | Below 13,000 |
| 1960–1970 | None (or rare) | ILGWU (with zip) | Often absent | 13,000–17,000 |
| 1971–1975 | Text only | ILGWU (zip era) | Required from 1971 | Above 17,000 |
| 1975–1995 | Text only | ILGWU "Look for the Union Label", ACTWU | Present (USA, Korea, Taiwan) | Above 17,000 |
| 1995–2000 | Text, early symbols | UNITE (rare) | Present (China common) | Above 17,000 |
| Post-2000 | Symbol-based | None | Present (China, Bangladesh, Vietnam) | Above 17,000 |
Union labels are among the most precise vintage dating tools. ILGWU labels without a zip code predate 1963. ILGWU labels with a zip code run from 1963–1995. The "Look for the Union Label" campaign design was introduced in 1975. ACWA labels date from 1914–1976, when the union became ACTWU. UNITE labels run from 1995–2004. Any garment with one of these labels was made in the USA during those active years.
Country of origin labels became mandatory in the US in 1971 — any garment without one likely predates that year. Specific country names also provide hard date ceilings: "Made in British Hong Kong" means before 1997, "Made in West Germany" means before 1990, and "Made in Yugoslavia" means before 1991–92. Manufacturing geography also tracks eras — "Made in USA" dominated through the early 1980s, Korea/Taiwan in the 1970s–80s, China from the 1990s onward.
The FTC's Care Labeling Rule took effect July 3, 1971. Any garment with no care label almost certainly predates that date. Written text care instructions (without symbols) place a garment between 1971 and roughly the late 1990s. The international symbol system (wash/bleach/dry icons) became standard in the US in the late 1990s and early 2000s — symbol-only care labels are a reliable post-1997 indicator.
Search the FTC's free public database at rn.ftc.gov. Enter the RN number shown on the label and the database returns the registered company name, address, and registration date. RN numbers below 13,000 predate 1959; 13,000–17,000 roughly spans the 1960s; above 17,000 is post-1970. WPL numbers indicate wool content and are primarily from the 1940s–1970s. The RN lookup is one of the most underused but reliable vintage authentication tools available.
Each brand has documented label transitions. For Levi's, the "Big E" red tab (all-caps LEVI'S) was used until 1971 — a single letter change splits the entire catalog. Champion's blue bar reverse-weave label dates to the late 1970s–80s. Nike's orange tag ran 1971–1978; the Swoosh label followed. For any major heritage brand, collectors have mapped every label variation by year — search "[brand] vintage label guide" for detailed photo references.
Weekly insights on reading vintage labels, authenticating finds, and discovering hidden value in secondhand clothing.