to dress (oneself or somebody else) in good, formal, or smart clothes
to dress (oneself or somebody else) in a particular costume clothes suited to a particular assumed role
The children were dressed up as pirates
to make (something) more attractive or suitable for a formal occasion, e.g. by adding accessories
to cause (something) to appear in a more favourable light, e.g. by distortion or exaggeration
to get dressed up