Counter to its name, the first thing most people do once inside is undress, not dress.

Intended to serve as a discreet space in which to disrobe and experiment with a variety of combinations of clothing items.

Cautious users should pay particular attention to the lack of locks on dressing room doors. A judicious knock before entering would have prevented much strife and gnashing of teeth...both yours and those of the dressing room inhabitant you have just exposed so rudely.