What's the noun for disguisings? Here's the word you're looking for.
guise
Customary way of speaking or acting; fashion, manner, practice (often used formerly in such phrases as "at his own guise"; that is, in his own fashion, to suit himself.)
External appearance in manner or dress; appropriate indication or expression; garb; shape.
“We suffer impatience under the guise of being so busy and efficient that we should not have to put up with those of the world who are not as busy and efficient as we are.”
“Death would manifest itself in the guise of the Grim Reaper to Bill and Ted during their bogus journey.”
“He can be described as an Egyptian officer dressed up in Asiatic guise.”
“It's a general description of nineteenth-century English Christmas customs, including wassailing and guising, apparently taken from published accounts.”
“However, there was revival from the late 18th century and seasonal and community festivals, mumming and guising all flourished.”
“The only exception to this is the full text of a guising, or Galoshin, play from Balmaghie.”
“But one night, under cover of darkness, and further concealed in a most cunning disguisement, a desperate burglar slid into his happy home, and robbed them all of everything.”
“We suffer impatience under the guise of being so busy and efficient that we should not have to put up with those of the world who are not as busy and efficient as we are.”
“Death would manifest itself in the guise of the Grim Reaper to Bill and Ted during their bogus journey.”
“He can be described as an Egyptian officer dressed up in Asiatic guise.”
“The guiser cunningly maneuvered through the crowd, concealing their true identity behind a clever disguise.”
“Of course this year I've got my own wee guiser who will be transformed into Tinkerbell tonight.”
“The saddest of these is the account of fourteen-year-old Anne Wadsworth, stabbed fatally by a cross-dressing guiser, who was carrying a posy to a wedding event.”