28/09/2026
Seam allowance is the extra fabric between the stitching line and the raw edge of your fabric. It gives you the space needed to join your pattern pieces together.
❓ WHY DOES SEAM ALLOWANCE MATTER?
If your seam allowance is incorrect, it can affect:
🧵 Sewing Fundamentals
Real sewing problems. Practical solutions.
🐩 The final garment measurements
🐩 How pattern pieces fit together
🐩 Seam strength
🐩 The finished shape of the garment
🐩 Whether your garment fits correctly
📏 COMMON SEAM ALLOWANCES
1 cm — often used for some lightweight garments and specific construction techniques.
1.5 cm — a common allowance for many dressmaking patterns.
2–2.5 cm — useful where extra allowance is needed, such as some hems or areas requiring fitting adjustment.
⚠️ Always follow the pattern instructions. There is no single seam allowance that is correct for every garment.
⭐ MRSVFANFONI'S PRO TIP
The seam allowance is NOT the same thing as your stitching line.
Your pattern may show a seam line, while the pattern edge includes the seam allowance. When sewing, use your machine's seam guide to maintain the required distance consistently.
💡 A 1.5 cm seam allowance means your stitching line should be 1.5 cm from the raw edge—not that you should sew randomly somewhere inside that space.
💬 QUESTION OF THE DAY
What seam allowance do you normally use when sewing?
1 cm? 1.5 cm? Something different?
Tell me in the comments! 👇
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Save this guide—you'll use seam allowance knowledge in almost every sewing project.
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Vanessa Fanfoni