Tā de yīzhuāng zhěngjié, gěi rén liúxià le hǎo yìnxiàng.
His neat attire made a good impression on people.
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The proverb 人靠衣装,马靠鞍装 (people rely on their clothes, horses rely on their saddles) means that appearance matters greatly - the Chinese equivalent of 'clothes make the man'.