early 13c., "alteration;" mid-14c., "action of substituting one thing for another;" verbal noun from change (v.). Changing-room is by 1852, originally for miners, gunpowder-factory workers, etc.
[A]lso not any fires or smoking are to be allowed ; and, under no pretense whatsoever, is any lucifer match to be permitted on board ; and, to guard against the infringement of this order, the clothes with pockets in them are to be taken off in changing room, or examined before beginning the work. [from British navy regulations for loading and storing gunpowder, Office of Ordnance, June 5, 1852]
updated on November 25, 2022