Is it authentic? You can't prove it from one sign. You build a case from several: the label, the stitching, the hardware, the fabric, and whether they all agree with each other. If two or more fail, walk away or disclose. Condition grading is a separate question, and you still have to answer it.
A seller lists a jacket as authentic, a buyer opens a not-as-described case, and now you are arguing about a zipper pull. The jacket may be real and the zipper may be a later replacement. That is the trap: authenticity and condition get blurred together, and both disputes land on you. Here is how we separate them.
What "Is It Authentic" Really Asks
Three different questions hide inside this one phrase:
- Is it made by the brand? Real versus counterfeit.
- Is it original? Real, but altered, re-hemmed, re-buttoned, or re-tagged.
- Is it what the listing says? Era, size, and material match the description.
Counterfeits are one risk. Franken-garments (a real body with a swapped label) and honest mistakes about era are more common in thrift bins. Treat every garment as three questions, not one.
The 8-Step Authenticity Check
Run these in order. Stop at the first hard failure; keep going if you only see soft flags.
- Read the main label. Check font weight, spacing, spelling, and the way it is sewn in. Crooked, glued, or fuzzy printing is a flag.
- Check the care and content tag. Fiber percentages should fit the brand's known materials. A "100% cashmere" tag on a garment that feels like acrylic is a flag.
- Look up the RN number. The registered identification number points to the company that registered the tag, not the year. If the RN belongs to a different company than the label claims, investigate. Note that licensees and parent companies can legitimately differ.
- Inspect the stitching. Count stitches per inch in a few places, look for straight lines, and check that the thread color is consistent with the brand's usual construction. Loose ends and uneven density are flags.
- Test the hardware. Zippers, snaps, and buttons often carry brand stamps. Check weight, engraving depth, and whether the zipper pull matches the stamp on the slider.
- Feel the fabric. Compare hand and weight against a known genuine piece. This is your Fabric Condition read and your authenticity read at once.
- Compare against references. Pull sold listings and brand archives for the same style. Check the cut, pocket placement, and label position.
- Check for consistency. Every element should match the era. A modern care tag sewn into a supposedly 1980s piece is a flag. A brand label in a lining that was clearly re-sewn is another.
One soft flag is not proof. Two or more, especially across label, hardware, and stitching, usually is. When you cannot decide, don't write "100% authentic." Describe what you see.
Signs That Look Fake but Aren't
Real garments fail checks for ordinary reasons. Before you call something fake, rule these out:
| Flag | Possible innocent cause |
|---|---|
| Uneven stitching | Factory variation, or a professional repair |
| Mismatched buttons | Owner replaced a lost button |
| Label font differs from current brand | Older or licensed production run |
| Missing care tag | Cut out for comfort |
| Different RN than expected | Licensee, subsidiary, or acquired company |
The pattern matters more than any single detail. A real jacket with a replaced zipper is still real, but it needs a disclosure and it affects the grade.
Where Condition Grading Comes In
Authenticity tells you what the item is. Condition tells you what it is worth. The two calls use different evidence, and a buyer can dispute either one.
GradeThread grades on a 1.0 to 10.0 scale across five weighted factors: Fabric Condition, Structural Integrity, Cosmetic Appearance, Functional Elements, and Odor & Cleanliness. The tiers run NWT, NWOT, Excellent, Very Good, Good, Fair, and Poor.
Your authenticity check feeds some of those factors directly:
- Functional Elements: A replaced zipper or non-original buttons are repairs. Note them, because they change how a buyer sees the piece.
- Structural Integrity: Re-stitched seams and altered hems show up here, and they also raise originality questions.
- Fabric Condition: Hand and weight tell you about both authenticity and wear.
A genuine piece with a swapped zipper might still be a strong Very Good. A questionable piece in perfect condition has a condition grade but an unresolved authenticity problem. Keep them separate in your listing so a buyer cannot say you hid either one.
How to Word the Listing
The wording matters on eBay, Poshmark, Mercari, and Grailed, where authenticity claims can trigger a not-as-described return or a platform review. Some practical rules:
- State what you verified: "Label, RN number, and hardware stamps match the brand's known production."
- State what you could not verify: "Care tag is missing, so fiber content is unconfirmed."
- Disclose every alteration or replacement, with a photo.
- Put the condition grade and the authenticity notes in separate parts of the description.
- Photograph the label, the RN or care tag, the hardware, and the stitching up close.
Avoid "guaranteed authentic" unless you have a third-party authentication to back it. You are describing evidence, not issuing a certificate. Our certificate covers condition, not brand authentication.
When to Pay for Outside Authentication
Your own check is enough for most thrift finds under about $100. For high-value pieces, such as luxury handbags, designer outerwear, or sneakers, a paid authentication service is worth the fee. Use one when the resale price is high, when the brand is heavily counterfeited, or when you have two or more soft flags and no way to resolve them. Then grade the condition yourself and attach both records to the listing.
Grade the Condition Once Authenticity Is Settled
Once you are confident about what you are holding, pick one garment and grade it. You get a numerical grade, a five-factor report, and a certificate a buyer can verify, so the condition half of the dispute is already answered.