Yes, you understand it well. Using "a" indicates that there might be more than one coat he liked to wear in winter. Using "the" the implication is that he had one coat he liked to wear in winter.
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EnglishmavenYes, you understand it well. Using "a" indicates that there might be more than one coat he liked to wear in winter. Using "the" the implication is that he had one coat he liked to wear in winter.Thank you, that's good.