Use 'be dressed up' for specific occasions where formal attire is expected or customary.

Event Specific

It can also mean wearing something more fancy than usual, not just black-tie formal.

Not Always Formal

'Be dressed up' often implies effort put into appearance and can be a compliment.

Commonly used when referring to dressing children in more formal or cute outfits.

Can mean the act of putting on day-to-day attire, often for children or those unable to dress themselves.

Often used to refer to wearing costumes for events like Halloween or themed parties.

Can also mean dressing in a fun, playful way, without the intent of deception.

'Be dressed up' can mean to present something in a more appealing way, often used metaphorically.

Sometimes it indicates an attempt to hide flaws or negative aspects.