Formal headgear (inf.) (6)
I believe the answer is:
topper
(Other definitions for topper that I've seen before include "Informally a top hat or jolly good fellow" , "Top hat (colloq.)" , "lid" , "expensive hat" , "Hat for formal occasions" .)
I believe the answer is:
topper
(Other definitions for topper that I've seen before include "Informally a top hat or jolly good fellow" , "Top hat (colloq.)" , "lid" , "expensive hat" , "Hat for formal occasions" .)