Reselling Guides
How to Tell If Clothing Is Vintage: The Tag and Stitch Checks That Date an Item
How to tell if clothing is vintage using the neck tag, the hem stitch, and the RN number. Five checks that separate a $6 shirt from a $60 one.
You are three racks into a thrift store holding a shirt whose brand tells you nothing. It could be a six dollar shirt someone bought at a mall in 2015, or it could be the same six dollars buying something a collector will pay sixty for. The difference is almost never the brand. It is the age, and the garment will tell you its age if you know which two inches of fabric to look at.
Why age is the part that pays
Vintage buyers shop by era before they shop by label. A plain blank tee from the right decade can outsell a nicer modern shirt from a name you recognize, because the supply of anything made in 1988 only ever shrinks. That is the whole engine behind vintage pricing, and it means the skill that matters at the rack is not brand recognition. It is dating.
Nobody dates a garment from one clue. You stack three or four cheap signals and let them agree with each other.
Check the hem stitch first
Flip the bottom hem or a sleeve cuff inside out and count the rows of stitching. One row is a single stitch. Two parallel rows running like a track is a double stitch.
Double-needle finishing became the industry norm for mass-produced tees through the middle of the 1990s, so a single-stitch hem is a reasonable signal that a shirt is older than that. Treat it as a signal and not a certificate. Smaller printers and leftover blank stock kept single stitch alive later in the decade, and plenty of modern reproduction shirts are made single stitch on purpose. The check is free and it takes two seconds, which is why it goes first, not because it is conclusive.
Read the neck tag for era markers
The tag is where most of the real information lives. A few things worth training your eye on:
| What you see on the tag | What it usually tells you |
|---|---|
| Made in USA | Common on older domestic production, increasingly rare after apparel manufacturing moved offshore |
| A union label | The garment came out of a unionized shop, which narrows the era considerably |
| An RN number | The company responsible for the garment, lookupable at the FTC |
| Care symbols only, no words | Later-era labeling, generally more modern |
| A single-color woven tag with no size printed separately | Older construction, worth a second look |
The union label is the sharpest of these because it carries a hard date. The International Ladies' Garment Workers' Union merged with the Amalgamated Clothing and Textile Workers Union in 1995 to form UNITE, and the label changed with it. An ILGWU label means the garment predates that merger. A UNITE label puts it after. That is a real boundary you can lean on, not a vibe.
Look up the RN number
If the tag carries an RN followed by digits, that is a Registered Identification Number issued by the Federal Trade Commission to identify the company responsible for the garment. You can search it free in the FTC's RN database at rn.ftc.gov.
Two things this gets you. First, it names the actual company when the brand on the tag is one you have never heard of, which sometimes turns an anonymous shirt into a licensed piece with a following. Second, RN numbers were issued over time, so a number tells you the garment cannot be older than when that number was assigned. Use it as a floor, not a date stamp. Companies keep and reuse the same RN for decades, so a low number does not prove the shirt itself is old.
Let the graphic date itself
Printed shirts frequently hand you the year outright. Look for a copyright line under the graphic, a tour itinerary on the back, an event year, a championship date, a stadium that no longer exists. This is the single most reliable dating method available at the rack, and it is the one people skip because they are looking at the front of the shirt instead of reading it.
When you find a printed year, that beats the stitch check and the tag check. The other signals exist for the shirts that do not tell you.
Turn the date into a price, not a guess
Age by itself does not set a number. Once you believe you have an era, the buying decision still comes down to what that exact item has actually sold for, so search eBay sold listings with the era in the search string and read the real results. An eighties tee of a band nobody collects is still an eighties tee nobody collects.
The same applies when you list it. If the evidence supports the decade, put it in the title where buyers search for it, and say in the description what the evidence was. A listing that reads "single stitch, Made in USA tag, no copyright date on the print" tells a vintage buyer you know what you are holding, and it protects you if someone later disputes the era.
The takeaway
Two inches of hem and one neck tag will answer the question that decides whether an item is worth your six dollars. Learn to stack the signals, trust the printed year over everything else, and confirm the price with sold comps before the item goes in your cart.
Sourcing is one piece of a much bigger system, and dating garments is one of the fastest skills to pay for itself. If you want the rest of it laid out in order, that is what The Income Lab is for.
