変装していた

was in disguise

→ 変装
phrase Rare #32,326
was in disguise Describes someone being disguised or wearing a disguise in the past. It can also mean “was disguised as ...” when followed by a person or thing.
JA: 彼は警察官に変装していた。
EN: He was disguised as a police officer.

その泥棒はおばあさん変装していた

The thief was disguised as an old woman.

かなり多くの人が変装していたのがだとわからなかった

Quite a lot of people didn't realize it was him in disguise.

変装していた彼に気づかなかった人も多かった

Many people didn't realize it was him in disguise.

かなり多くの人が変装していたのがだったとは気づかなかった

Quite a lot of people didn't realize it was him in disguise.

彼女は男の服を着て変装していた

She was disguised in men's clothing.