“官服”常见的英文表达是 official uniform 或 official attire 。
official uniform：强调这是具有官方性质、特定样式的制服，常用于正式场合，突出其作为官方身份标识的特征。例如：The officials were dressed in their official uniforms at the grand ceremony.（在盛大的典礼上，官员们都身着官服。）
official attire：“attire” 侧重于指服装、穿着，“official attire” 即官方场合的着装，也可用来表示官服。例如：In ancient times, different ranks had their own distinct official attire.（在古代，不同品级的官员有各自独特的官服。 ）