Definition of guises:
(n) :
An external appearance in manner or dress; an appropriate indication or expression; a garb; a shape.
(n) :
A misleading appearance; a cover, a cloak.
(n) :
A customary way of speaking or acting; a fashion, a manner, a practice (often used formerly in such phrases as "at his own guise"; that is, in his own fashion, to suit himself.)
(v) :
(archaic, transitive) To dress.
(v) :
(archaic, intransitive) To act as a guiser; to go dressed up in a parade etc.
(n) :
A surname.