Legitimate labels can read JUNYA WATANABE COMME des GARCONS, JUNYA WATANABE MAN or era-specific variations. Co-branding is common and not automatically suspicious: collaboration labels, patches and product codes should be checked against the exact release.
Sui Generis approach: first establish the likely era and product category, then compare the wordmark/logo, label construction, typography and placement to documented examples from that same period. A genuine vintage label can be very different from the current retail label.
Brand labels, size tabs and care/product labels should be assessed as a set. For Junya Watanabe, expected construction can change by line and era, but the label materials, edge finishing, stitch attachment, printing/weaving quality, fiber/origin information and wear should be internally coherent.
A label that looks older than the garment, a pristine label on a heavily worn item, a care label whose language/fiber data conflict with the garment, or obviously re-sewn label stitches are reasons to slow down. Alterations can move or remove labels, so document tailoring evidence before concluding the label was transplanted.
For the FW26 eYe JUNYA WATANABE MAN × Stüssy release, co-branded Stüssy woven patches and embroidery can appear alongside eYe branding; the tactical jacket also carries Spiewak collaboration context. Treat Stüssy and Spiewak as documented partner signals for this release, not as evidence that the piece is ordinary Junya-only production.