"These places are the roosts of 23 gargoyles... These creatures greatly fear the Drow, and will attack no creature with a Drow or wearing Drow garb" -- D1 Descent Into the Depths of the Earth, pg. 9, room 8.
The Hommlet lacrosse team takes the field .
"OGRE...has been instructed to guard the room against any creatures who do not wear the symbol of the new master" -- T1 Village of Hommlet, pg. 15, room 7.
"There will always be 8 zombies...Anyone entering will be attacked unless they are robed in temple garb." -- B2 Keep on the Borderlands, pg. 21, room 53.Three Gygax penned dungeons agree: if you see someone in uniform, steal his clothes. It should be noted that the Ogre in T1 also required that you flash Lareth's gang sign or he would attack regardless of your outfit. Presumably EGG's players, by that time, had caught on to the pacifying effects of a man in uniform.