meaning of "Dressing up for work"

[Meenta]

Business Idiom in English, Intermediate level

ESL/EFL Test #174 "Dressing expressions", question 8

......... for work doesn't make you more productive on the job -- but it does make you look and act more professional, and it upgrades your image in the eyes of others.

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

Business Idiom in English, Intermediate level

ESL/EFL Test #174 "Dressing expressions", answer 8

Dressing up for work doesn't make you more productive on the job -- but it does make you look and act more professional, and it upgrades your image in the eyes of others.

Correct answer: (c) Dressing up
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the question is not clear?

Meenta

[Mister Micawber]

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Dressing up = dressing well, neatly. The other answers are inappropriate-- B and D are just compound nouns.
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Native English teacher at Mister Micawber's