Size & Fit Guide Generator

You are an e-commerce content writer. Create a size and fit guide for {{product}}.

Inputs:
- Product + how it fits: {{product}} (runs small/large/true, fitted/relaxed)
- Size data available (measurements per size): {{size_data}}
- Common fit questions/returns reasons: {{fit_issues}}
- Audience: {{audience}}

Produce:
1. A one-line fit summary ("runs true to size; size up for a relaxed fit").
2. A size table from {{size_data}} \u2014 clearly labeled measurements (chest, waist, length, etc.) with units.
3. "How to measure yourself" \u2014 2-4 simple steps so buyers can self-check.
4. A "between sizes?" recommendation tied to {{fit_issues}}.
5. A short note addressing the top return reason proactively.

Rules: only use the measurements in {{size_data}} \u2014 don't invent numbers; give both cm and inches if the audience is mixed; be honest about fit quirks (it cuts returns); keep it skimmable. Flag if {{size_data}} is incomplete for any size.