# Suit and Blazer Grading: Shoulder Seam Integrity, Lining Tears, and Buttonhole Wear

_By GradeThread Team · Published July 6, 2026_

> A pressed blazer can still fail at the shoulder seam. Here's how to grade vintage suit and blazer condition using structure, not just surface.

# Suit and Blazer Grading: Shoulder Seam Integrity, Lining Tears, and Buttonhole Wear

To grade vintage suit and blazer condition correctly, check three structural zones before you touch the fabric surface: the shoulder seam and canvas underneath it, the lining at the armpit and pocket bags, and the buttonholes at the point of most repeated stress. A jacket can look pressed and clean in photos and still drop a full tier once you flex the shoulder or turn the lining inside out.

Structured tailoring is unforgiving. Unlike a knit or a tee, a blazer has a skeleton — canvas, shoulder pads, interfacing — sitting between the shell fabric and the lining. That skeleton fails silently. You won't see it in a flatlay. You'll see it when a buyer opens a return case three weeks later saying the shoulder "looks lumpy" or the sleeve "pulls funny." We've graded enough secondhand tailoring to know the surface almost never tells the whole story.

## Why Structured Jackets Grade Differently Than Casual Wear

A cotton tee has one layer. A blazer has five to seven, depending on construction: shell fabric, chest canvas, shoulder pad, sleeve head wadding, interfacing, lining, and interlining in some wool coats. Each layer ages at a different rate, and each layer can fail independently of the others.

This is why a jacket that scores well on Fabric Condition — no pilling, no fading, wool still has its hand — can still land at Very Good or Good once you factor in Structural Integrity. The shell can be immaculate while the canvas underneath has broken down, delaminated, or bubbled. That's a defect a casual-wear grader never has to think about, and it's the single biggest reason suits and blazers get graded wrong by sellers used to grading tees and hoodies.

## The Shoulder Seam Test: How to Assess Structural Integrity

The shoulder seam is where a blazer's frame either holds or gives out. Under Structural Integrity, this is the first place we check, before hems, before pockets, before buttons.

Here's what separates cosmetic wear from a real structural fail:

- **Rope or roll at the seam line** — a slight ridge is normal construction, not damage. Ignore it.
- **Puckering that wasn't there when new** — this signals the canvas or shoulder pad has shifted or the seam has been let out. Grade this as a Structural Integrity deduction, not a cosmetic one.
- **Divots or lumps under the shoulder pad** — press two fingers into the shoulder cap and rotate. Foam pads break down and crumble with age; horsehair canvas can bunch. Either drops the garment out of Excellent territory.
- **Seam separation at the sleeve head** — pull the sleeve gently away from the body at a 45-degree angle. Any daylight visible at the stitch line is a functional failure, not a cosmetic one, and it belongs in the report even if it's a quarter-inch.
- **Asymmetry between shoulders** — lay the jacket flat, shoulder to shoulder. A half-inch difference from wear or a bad past alteration should be disclosed, not smoothed over in photos.

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