titivate \TIT-uh-vayt\ (transitive and intransitive verb) - To smarten up; to spruce up.
"I decided tonight it was time to put away all the black mourning clothes, cut my hair, and titivate myself a bit, as Blackie so aptly calls it." -- Barbara Taylor Bradford, 'Emma's Secret'
Titivate is perhaps from tidy + the quasi-Latin ending -vate. When the word originally came into the language, it was written tidivate or tiddivate. The noun form is titivation.