Fashion · 3 audits
Stitch Per Inch (SPI) — Verified Audits
SPI is one of the few measurable quality metrics accessible without laboratory equipment. Count stitches on a seam with a ruler and magnifier. Budget alternatives with 10+ SPI offer comparable seam strength to luxury originals at much lower cost.
Audits using Stitch Per Inch (SPI)
How to Spot a $5,000 Stitch: Saddle Stitch vs Machine Lock — The 3-Second Field Test
The single construction detail that separates every Hermès bag from every factory approximation. SPI benchmarks, thread path mechanics, and the field test you can do in any store.
The Row Margaux: A Molecular Construction Audit & The 2026 Material Match
The Row Margaux ($5,900) vs three full-grain Italian alternatives under $250. Saddle stitch SPI, grain density, hardware weight, and the only brand that passes every test.
Celine Triomphe Frame Bag Alternatives: Edge Painting vs Edge Tape Audit (2026)
The Triomphe's $3,950 price includes 7 coats of Roux edge resin. The Edge Paint field test (fingernail drag) separates 3-year durability from 18-month tape. Two alternatives pass at under $300.
What is Stitch Per Inch (SPI)?
The number of stitches in one linear inch of seam. Industry standard for quality garments is 8–12 SPI. Luxury tailoring typically achieves 12–16 SPI. Higher SPI creates stronger, finer seams with less puckering.
Full glossary definition →