泳衣（英式舊說法）
完整說法原是 swimming costume——為了下水這件事而穿的那一套；日子久了英國人把前面兩個字省掉，就直接說 costume。
swimsuit (BrE) · noun · B1
British English for a swimsuit — clothes you wear for swimming.
泳衣
核心畫面
Picture the rail backstage: a whole outfit hanging there, put together so that whoever wears it reads instantly as somebody else — a king, a rabbit, a farmer from a hundred years ago. A costume is clothing chosen to say who you are meant to be, not clothing chosen because it is comfortable.
可以想成：後台那排掛著的整套衣服——穿上去，別人一眼就看出你現在是誰：國王、兔子、一百年前的農夫。costume 指…更多收起
可以想成：後台那排掛著的整套衣服——穿上去，別人一眼就看出你現在是誰：國王、兔子、一百年前的農夫。costume 指的是「為了表明身分而穿的一整套」，不是因為舒服或好看才挑的衣服。也因為是一整套，它常常是可數的：a costume、two costumes。From the picture
Also in this word
stage/dress-up outfit · noun · A2
A set of clothes that an actor wears, or that you wear to look like a person, animal, or character.
戲服；扮裝
traditional/period dress · noun · B1
A set of clothes typical of a certain country or a past time.
傳統服裝；時代服裝
原始詞典資料5 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
costumenoun/ˈkɒs.tjuːm/
- 1
A style of dress, including garments, accessories and hairstyle, especially as characteristic of a particular country, period or people.
- the sight of thousands of people gathered to watch men walk the streets openly in female costume
- The apology came after a netizen claimed Soberano was supposedly doing a black face, but the latter said, in defense, it was just a “costume.”
- 2
An outfit or a disguise worn as fancy dress etc.
- We wore gorilla costumes to the party.
- 3
A set of clothes appropriate for a particular occasion or season.
- The bride wore a grey going-away costume.
- 4
A swimming costume.
- They call their bathing suits down there "costumes."
costumeverb/ˈkɒs.tjuːm/
- 1
To dress or adorn with a costume or appropriate garb.
- Seated on the carpet, by the side of this basin, was seen Mr. Rochester, costumed in shawls, with a turban on his head. His dark eyes and swarthy skin and Paynim features suited the costume exactly. He looked the very model of an Eastern emir, an agent or a victim of the bowstring.
- "The Chengtu revolutionaries were fantastically colourful in the Szechwanese manner—they costumed themselves as heroes of the stage and their energies were chiefly occupied in tying ropes across the main streets so that when Imperial officials rode by in their litters they would have to get down and crawl under, losing face.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。