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The expression “sur son 31” in French translates to “dressed to the nines” or “in one’s best attire” in English.

Here are some articles in French that delve into the origin and meaning of this expression:

”Sur son 31″ – Projet Voltaire: [https://www.projet-voltaire.fr/origines/expression-se-mettre-sur-son-trente-et-un/](https://www.projet-voltaire.fr/origines/expression-se-mettre-sur-son-trente-et-un/)
This article explores the historical origins of the expression, tracing it back to military uniforms and their numbering system.

”Se mettre sur son trente-et-un” – Français avec Pierre: [https://www.projet-voltaire.fr/origines/expression-se-mettre-sur-son-trente-et-un/](https://www.projet-voltaire.fr/origines/expression-se-mettre-sur-son-trente-et-un/)

This resource provides a concise explanation of the expression’s meaning and usage in modern French.

”L’expression « sur son 31 »” – La Puce à l’oreille: [https://thefrenchroomhome.wordpress.com/2020/05/10/mettre-la-puce-a-oreille-de-quelqu-un/](https://thefrenchroomhome.wordpress.com/2020/05/10/mettre-la-puce-a-oreille-de-quelqu-un/)

This article offers a more in-depth analysis of the expression’s evolution and cultural significance.

I hope these articles help you understand the meaning and origins of “sur son 31” in French!