Celestia and Luna's disguises

Princess Celestia and Princess Luna commonly disguise themselves when they are in danger to confuse the enemy. They get this from Shaggy and Scooby as they spend quite a bit of time with them.

Examples
While in Germany after being chased by Nazi zombies the two princesses dressed up as German officers in an attempt to get the zombies to leave

In England while he chased by undead knights they dressed up as royalty and ordered the knights to go on a quest.

While visiting Indiana being chased by a demogorgon they dressed up as scientists and strapped it to a operation table.

In Nevada while being stalled by numerous Xenomorphs they dressed up as military soldiers and welcomed the aliens to earth before locking them in a cage.

In Germany for a second time inside a zeppelin they dressed up as German pilots and dropped the soldiers from the airship.