“People are looking for an excuse to dress up,” said Justin Jorgensen, who started Dapper Day in 2011 and has organized five of the events, all at Disneyland. The latest Dapper Day — the same Sunday as the Oscars, Hollywood’s own dress-up day — drew an estimated crowd of 10,000 to the Anaheim, Calif., park and about 1,000 more at Florida’s Disney World.