Seam allowance means the fabric between the stitching line and the raw cut edge inside a garment.
What this changes in a garment
Its width and finish affect strength, alteration potential and how safely a seam can be repaired.
How to assess the workmanship
Look inside: edges should be secure, curves should turn smoothly and heavily stressed seams should have enough material and reinforcement.
The practical takeaway
When a product description mentions Seam allowance, return to the garment and verify the claim. Ask what the feature changes for your body, your day and the long-term care of the piece.