difference between dressing down and dressing up

[Dressy]

Business Idiom in English, Intermediate level

ESL/EFL Test #174 "Dressing expressions", question 1

We choose to wear different outfits for different occasions, putting on jumpers and scarves when it is cold and ......... smartly for formal events.

(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 1

We choose to wear different outfits for different occasions, putting on jumpers and scarves when it is cold and dressing up smartly for formal events.

Correct answer: (c) dressing up
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what's the difference between dressing down and dressing up?

Dressy

[Mister Micawber]

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Dressing up is putting on more formal clothes. Dressing down is putting on more casual clothes.
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Native English teacher at Mister Micawber's