What this tool does
- Calculates your actual total ease when you enter a finished garment measurement.
- Shows a Sew Smarter starting range for close, slim, regular, relaxed or oversized fit.
- Converts that range into a suggested finished garment measurement based on your own body measurement.
- Lets you compare all five fit intentions side by side before you alter a pattern.
Choose the garment and fit intention
These are broad starting points, not industry standards or fit guarantees. Use them to interrogate a pattern — not to replace the pattern maker's own instructions.
Enter your body measurement to see a starting ease range and suggested finished measurement for the garment and fit you selected.
This calculator runs in your browser. The measurements you enter are not submitted to or stored by Sew Smarter.
How to use the fit guide
The tool treats close, slim, regular, relaxed and oversized as silhouette intentions, not size labels. A regular-fit coat needs more room than a regular-fit dress because it must accommodate structure and often layers. A close stretch top may legitimately use zero or negative ease, while the same number in a non-stretch woven bodice could be unwearable.
Why fabric still changes the answer
The number alone cannot tell you whether a garment will fit well. Stretch percentage, recovery, thickness, drape and layering can all change the result. A stretch knit may be designed with zero or negative ease. A coat in heavy cloth may need substantially more room than a lightweight unlined jacket. The calculator therefore shows a fabric note alongside the numerical range rather than pretending one universal adjustment works for every material.
Example: 96 cm bust in a regular-fit dress
If the selected Sew Smarter starting range is +6 to +10 cm, a 96 cm body bust translates to a finished bust of approximately 102 to 106 cm. If the pattern's finished bust is 104 cm, the actual ease is +8 cm and sits inside that starting range. That does not prove the dress will fit perfectly — but it gives you a much better question to ask before cutting.
Before cutting your final fabric
- Confirm you are comparing the same measurement point and the same basis — full circumference with full circumference.
- Check whether the finished garment measurement already includes design ease.
- Read the pattern's recommended fabric and stretch percentage.
- Check closures, lining, shoulder structure, sleeves and layering needs.
- For expensive fabric or substantial alterations, make a toile / test garment first.
Frequently asked questions
Are these ease ranges industry standards?
No. There is no single universal ease table that works for every garment, brand, fabric and wearer. The ranges in this tool are deliberately broad Sew Smarter starting points to help you assess a pattern more intelligently.
Why does a jacket show more ease than a dress?
Jackets usually need more room for movement, structure and sometimes layering. A coat needs more again. Using the same ease target for every garment would be misleading.
Can a stretch garment have negative ease?
Yes, when the design and fabric are intended for it. Always check the required stretch percentage and recovery rather than assuming any stretch fabric can tolerate the same negative ease.
Can this calculator guarantee my garment will fit?
No. Fit depends on more than circumference. Body shape, pattern shape, length, shoulder and armhole balance, fabric behaviour and construction all matter. Treat the result as guidance and verify important changes before cutting final fabric.
Use the number with the rest of the fit picture
Read the Sew Smarter guides to pattern ease, finished garment measurements, sizing and grading before making substantial pattern changes.