Wearing the correct dress for any occasion is a matter of good manners .

在任何场合都穿合适的衣服是一种礼貌。

语言点:a matter of……(关于...的)问题, eg: Whether you do or not is a matter of principle. 你做与不做是一个原则问题。
as a matter of fact 其实,事实上

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