Mfcttrf

In Japanese, there's a well-known saying that goes: おしゃれは足元から (oshare wa ashimoto kara) with the literal meaning of "Every good outfit starts with the shoes" -- or as we often put it in English, "Shoes complete the outfit".

This saying drums home the importance of investing in good footwear, first and foremost: When putting together an outfit, be sure to start from the shoes up, as shoes generally make the loudest statement. You may wear a fancy suit, but if your shoes are not up to scratch or simply not polished, they can all too easily ruin your otherwise perfect look.

Even a cursory glance at all these titles showing up on YouTube will tell you how commonly the saying is used.

C’est à ses chaussures que l’on reconnaît l’homme / la femme de goût.

The only one I have on the top of my mind is "Se mettre sur son trente-et-un." or "Être sur son trente-et-un"

Which mean

Mettre ses plus beaux habits. Être très bien habillé.

note: I will update it later if I think about anything else.

There does not seem to be a widely known precept for this idea in French; it has to be translated more or less literally. The following way to put it appears to fulfil the need for a basic, faithful rendering.

• Une bonne tenue vestimentaire commence par les chaussures.

En fonction de l'explication davantage que de l'expression, sur le modèle de « l'habit ne fait pas le moine », influencé peut-être aussi par l'idée de « make or break (the outfit) », je dirais :

Les souliers (chaussures) font l'habit.