Dating Vintage Clothing by Tags, Labels & Stitching

Every garment carries its birth certificate — you just have to know which seam it’s sewn into. Tags date clothing within a decade or better, and on denim the details move prices by hundreds of dollars.

The care tag cutoff

The single fastest test in vintage clothing: the FTC required care instruction labels starting in 1971. No care tag (and no sign one was cut out) leans pre-1971. Fabric content labeling came in around 1960 — a garment listing no fiber content at all is likely 1950s or earlier. And “Made in USA” went from default to selling point as production moved offshore through the ’80s and ’90s.

Union labels and RN numbers

An ILGWU union label is a date stamp if you read the design: “AFL-CIO” in the text means post-1955; the red-white-and-blue label runs 1974 to 1995. RN numbers (registered identification numbers) were issued from 1959 onward and climb roughly chronologically — a low RN means an early registration, and free lookup tables online convert RN ranges to approximate years. A WPL number instead of an RN points to a wool-products registration from before 1959.

Denim: the Levi’s hierarchy

The famous one: the red tab reading “LEVI’S” in all caps (“Big E”) is pre-1971; lowercase “Levi’s” (“little e”) is after. Selvedge denim with a red line inside the outseam means pre-mid-1980s American looms on 501s — turn up the cuff to check. Single-stitch back pockets and single-felled seams lean earlier; care tags, again, put it after 1971. Paper patches, hidden rivets, and “Lot 501XX” climb into serious collector money.

Hardware and stitching for everything else

Metal zippers (Talon, Conmar, Crown) dominate through the 1960s; nylon coil takes over after. A side or back metal zip in a dress leans 1940s–50s. Pinked seam edges, chain-stitched hems, and generous seam allowances are mid-century workroom habits. Union-made, metal-zipped, no care tag, fiber unlisted — stack the tells and the decade names itself.