It's hard to tell what it really looks like because of the one reference picture (the downside of artbook costumes). To me, it looks like several flowers and leaves on either a headband or a mini-top hat, secured onto his head with a ribbon. Plus it has red ribbons trailing down from it. I would start with deciding headband or hat? Then finding the flowers and ribbon. Theennn it's hot glue timeee!
[center]Proud member of 5th Kira Cosplay: cosplay sketches, music videos, and bloopers!