Dapper Day 3/14/15

Anyone dressing for Dapper Day on 3/14? Or participated in the past? This is my first, and I’m not quite sure what to expect. Seems Dapper Day is a huge deal at DLR but I can’t find much info for WDW. Any tips or insight appreciated!

Dapper Day is also Pi day of the century. It happens at DHS, I think.