Tā de fēngyāo ràng suǒyǒu lǐfú dōu chuānchū xiàoguǒ.
Her wasp waist makes any gown look great.
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Named for the bee/wasp's narrow middle section (蜂 = bee). The companion idiom 蜂腰削背 literally 'bee waist and sloped back' describes a classic willowy figure.