How can you tell if a designer bag is fake?

Check construction before logos: stitch alignment and density, edge finishing, hardware weight and engraving depth, then label fonts and attachment, then serial or date-code format. Counterfeits reproduce logos well and cut corners on the expensive details.

Can an app tell if something is fake?

A multi-angle authenticity scan catches obvious and moderately subtle counterfeits and flags specific suspect markers with a confidence score. For high-value pieces, professional authentication remains worthwhile.

August 11, 2026 · 8 min read

How to Spot Fake Designer Items When Thrifting

Short answer

Authenticate in this order: construction quality first (stitching alignment, edge finishing), then hardware (weight, engraving depth, plating), then tags and labels (font, spacing, stitch attachment), then serials and date codes, then the smell and feel of the material. Fakes have become excellent at logos and poor at everything expensive to fake, which is why the logo is the last thing to check, not the first.

Counterfeits got good. The logo is now the easiest part to copy and the worst thing to judge by, so an authentication routine that starts with the monogram starts in the wrong place.

Check in cost order

The useful principle: counterfeiters optimize for what buyers glance at and cut corners on what is expensive to replicate. So work from expensive to cheap.

1. Construction

Stitch density and alignment. Genuine goods hold consistent stitch counts and dead-straight lines; fakes wander, especially where seams turn a corner.
Edge finishing. Painted or folded edges should be even, smooth and fully sealed. Thin, cracked or sloppily applied edge paint is a strong tell.
Symmetry across a logo or seam. Pattern alignment across a center seam is costly to get right and frequently skipped.

2. Hardware

Weight. Real hardware is usually heavier than it looks. Light, hollow-feeling zips and clasps are a bad sign.
Engraving. Crisp, evenly deep, correctly spaced. Stamped-looking, shallow or uneven lettering is a tell.
Plating and wear. Genuine plating wears to a warm base metal; cheap plating flakes in patches and often shows a gray or greenish underlayer.

3. Tags and labels

Font weight and letter spacing against a known reference. This is where most fakes still fail on close comparison.
How the label is attached, stitched versus glued, and whether the stitching matches the surrounding construction.
Care labels: correct country of manufacture, plausible material composition, sensible laundering symbols.

4. Serials, date codes and authentication chips

Formats vary by brand and era, and several major houses have moved to embedded chips rather than printed codes. A code that exists is not proof; a code in the wrong format for the claimed year is close to proof of the opposite.

5. Material and smell

Genuine leather smells like leather and softens with handling. A strong chemical or plastic smell, or a surface that feels uniformly plasticky, is a reliable signal, and one no photograph will ever give you.

Checking in the store

ThriftAI includes a multi-angle authenticity scan: you photograph the item from several prescribed angles, and it returns a verdict with a confidence score and, where it finds them, the specific markers that look wrong. 35,000 authenticity scans have been run through it to date.

Treat it as what it is: a fast, well-informed second opinion that catches the obvious and the moderately subtle. For a genuinely high-value piece, professional authentication is still worth its fee.