spiff 
(spĭf) Informal
(spĭf) Informal tr.v. spiffed, spiff·ing, spiffs
To make attractive, stylish, or up-to-date: spiffed up the old storefront.
n.
Attractiveness or charm in appearance, dress, or manners: "He may need more than spiff to get him through the bad patches ahead" (James Wolcott).
[Possibly from dialectal spiff, well-dressed.]