Meaning of 看菜吃饭,量体裁衣

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kān cài chī fàn , liáng cái (Trad.: 看菜吃飯,量體裁衣)
eat depending on the dish, cut cloth according to the body (idiom); to fit the appetite to the dishes and the dress to the figure; to act according to actual circumstances; to live within one's means