Answer:

hatters

Answer	Crossword Clue
HATTERS	Milliners
HATTERS	Mad ones?
HATTERS	Pillbox creators

HATTERS	Chapeau vendors.
HATTERS	Subjects of Carroll and Cronin.
HATTERS	Relatives of haberdashers.
HATTERS	Workers in haberdasheries.
HATTERS	Sellers of stetsons.
HATTERS	Alice's host and others.
HATTERS	Busy businessmen before Easter
HATTERS	They may be mad

HATTERS	Chapeau specialists