Fit Lab
Fit Lab is the recommender’s simulator. Enter example shopper numbers and see exactly what shoppers will see — which size wins, and how every other size scores — before the chart goes live.
Open Fit Lab
Section titled “Open Fit Lab”- Open a chart in the editor.
- Click Test in Fit Lab in the top utility bar (or open a chart and navigate to its Fit Lab page).
The header shows which chart you’re testing. Back to editor returns when you’re done.
Step 1: Choose shopper input
Section titled “Step 1: Choose shopper input”Pick the mode your test shopper represents:
- Use height & weight (most shoppers) — height (cm, 100–230) and weight (kg, 25–250).
- I know my measurements — bust, waist, hip (cm, 40–200).
Both modes accept the same ranges shoppers see on the storefront.
Step 2: Read the results
Section titled “Step 2: Read the results”As you type, Fit Lab updates:
- Best: size M — score 96 — the winning size and its score, with “Estimated from height & weight” when using that mode.
- A reason line in the same format shoppers see (“bust 88 falls in M (86–91)”).
- A table scoring every size:
| Size | Verdict | Score |
|---|---|---|
| S | Too tight | 38 |
| M | Perfect | 96 |
| L | A little loose | 81 |
| XL | Too loose | 52 |
Step 3: Interpret and act
Section titled “Step 3: Interpret and act”| What you see | What it usually means |
|---|---|
| One Perfect size, neighbours loose/tight | Healthy chart — publish |
| Two sizes nearly tied | Expected with adjacent sizes; the larger wins ties by design |
| No size reaches Perfect for typical shoppers | Your ranges may be shifted — re-check the source numbers |
| Everything “Too tight” or “Too loose” | Measurement type (body vs garment) may be set wrong — verify in the editor |
Garment note
Section titled “Garment note”For garment charts, the panel reminds you: measurements are eased down (−ease) and stretched (+10%) before scoring. For body charts, numbers are matched as-is. If Fit Lab results look systematically one step off on a garment chart, the numbers may actually be body measurements — switch the type in the editor and retest.
Common uses
Section titled “Common uses”- Before first publish — run 3–4 typical shoppers (small, average, tall) through Fit Lab and check each gets a sensible winner.
- After an import — imports can transpose numbers; one Fit Lab pass catches it.
- Before a sale push — sanity-check the chart your bestseller uses.