"She never dresses up, even when she goes to the opera"
"The young girls were all fancied up for the party"

"The researcher tried to dress up the uninteresting data"
"Don't try to dress up the unpleasant truth"

"caparison the horses for the festive occasion"

"We dressed up for Halloween as pumpkins"

"She dresses in the latest Paris fashion"
"he dressed up in a suit and tie"