Why used dressing up?

[Lilia]

Business Idiom in English, Intermediate level

ESL/EFL Test #174 "Dressing expressions", question 7

The door opened a few inches to reveal a beautiful woman wearing a red ..........

(a) dressing room
(b) dressing down
(c) dressing gown
(d) dressing up

Business Idiom in English, Intermediate level

ESL/EFL Test #174 "Dressing expressions", answer 7

The door opened a few inches to reveal a beautiful woman wearing a red dressing gown.

Correct answer: (c) dressing gown

Your answer was: incorrect
The door opened a few inches to reveal a beautiful woman wearing a red dressing down.
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Why used dressing up?
If I find the meaning into cambridge distionary isdressing-down Show phonetics
noun [S]
an act of speaking angrily to someone because they have done something wrong:
She gave me a dressing-down for getting there late.

Lilia

[Mister Micawber]

.
I don't understand your question, maybe. Are you asking the meaning of 'dress up'?

Dress up = put on special clothes to appear particularly appealing and attractive.

'Up' here means 'completely'.
.
_________________
Canadian-American native speaker
who teaches English for a living at Mister Micawber's
ESL cafe: Interview with Mister Micawber