He tried to organize things so that the trip would be dressed up as a UN mission.

他竭力筹备好各项事宜，以便这次出行看上去像联合国代表团出访一样。

《柯林斯英汉双解大词典》

I have dressed up properly for this meeting, which was supposed to be my yearly appraisal.

为了这次会见，我做了适度的打扮，我以为是对我进行年度考核呢。

youdao

Why not go out to a “swankier” restaurant than usual (it doesn’t have to be much more expensive)， or just get dressed up in your party clothes for a special meal for two at home?

去家平常高档一点的餐厅(也不需要贵很多)，或者在家吃饭的时候，偶尔穿上你去派对时候的礼服。

youdao

where there's going to be people dressed up as poisonous plants.

在那里，人们将装扮成有毒的植物。

在市场遇到的人 - SpeakingMax英语口语达人

They don't need to be dressed up in a vision of some shining new world order that lives mainly in Mr Blair's well-meaning imagination.

ECONOMIST: Bagehot

This turned out to be a loan to Enron dressed up as an electricity contract, which had the effect of hiding the debt from Enron's investors.

ECONOMIST: But corruption in this state can be a bipartisan business

When a tech entrepreneur who favors Patagonia jackets and sneakers told San Francisco dealer Claudia Altman-Siegel he was headed to the Swiss art fair Art Basel, she had some advice: "I was like, 'No one's going to be nice to you if you're not dressed up, '" she said.

WSJ: Art's New High-Tech Patrons