Sometimes a customer's measurements don't all land in the same size — their chest may match L while their waist and hips match M. Here's how SmartSize decides in those cases, and how you can tune and test that decision for each quiz.
How SmartSize decides between two sizes
SmartSize scores every size on your size chart against the customer's measurements and recommends the best overall match. Three settings control what happens when different body parts point to different sizes:
Priorities — which body parts must fit. A High priority measurement can decide the size on its own; a Low priority measurement only nudges the result.
Fit ease — how the garment is meant to fit. Fitted styles are stricter about tightness; relaxed and oversized styles allow more room.
Fabric stretch — stretchy fabric lets a slightly snug size still work. Stretch never makes a loose size fit better.
When two sizes end up almost equally good, SmartSize picks the safer one. That's usually the larger size — except for slim, stretchy garments, where the smaller size is the better choice. For kids, SmartSize always leans to the larger size.
Where the fit settings live
Open your quiz and scroll to Advanced settings. The Product fit section holds everything that controls between-sizes decisions.
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Expand it to set Fit ease, Fabric stretch, and Priorities for measurement. To try your settings with real numbers, click Open Fit Lab at the top of the page.
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Simulate a customer in the Fit Lab
In Body measurements, type the measurements of a customer you want to test — or pick an example body type. The recommendation on the right updates instantly.
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The Product configuration section mirrors your quiz's fit settings. Changes here are a preview only — nothing is saved until you click Apply to quiz.
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Set which measurements matter most
In Priorities, tell SmartSize which body part has to fit for this garment. For a top that must sit well at the chest, set Bust to High and Hip to Low.
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Click Show next to Size chart to see the measurement ranges behind the simulation. This makes it easy to spot where a customer sits relative to each size.
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Read the simulation results
The results panel shows the recommended size, and for each measurement, where the customer falls within that size's range. This customer fits comfortably in M on all three measurements.
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Click any other size to see why it wasn't chosen. Size L would be too loose at the chest, waist, and hips for this customer, so it's marked as not recommended.
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When the customer is between sizes
Now the between-sizes case. This customer's bust measures 93 cm — size L on this chart — while their waist and hips still fall in M. Because Bust is set to High priority, SmartSize recommends L: the chest must fit, and the waist and hips are allowed to feel roomy. Your customer sees the same honest explanation with their result.
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Change the priorities and the recommendation can change with them — with a different high-priority body part, the same measurements can resolve to a different size. Test a few realistic customers here to confirm the trade-off matches how the garment should fit.
Apply your changes to the quiz
Happy with the behavior? Click Apply to quiz in the top-right corner to save the product configuration to your quiz. Until you do, Fit Lab changes stay a preview.
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💡 Tip: Not sure which priorities to pick? Click Industry reference below the Priorities panel for typical settings by garment type — and when in doubt, keep the defaults.