Correct
便衣
/ biànyī /
Strokes
Definition
civilian clothes/plain clothes/plainclothesman
Example
As a Noun
civilian/plain clothes; mufti
1
Biànyī
便衣
tèwu
特务
plainclothes agent
2
Biànyījǐngchá
便衣警察
plainclothes policeman/cop; policeman/cop in plain clothes; policeman/cop in mufti
As a Noun
plainclothes man