Like any space, the dimensions and design of a closet (or dressing room in this case) are planned to either work with an existing space or, if new construction, suit the client's particular needs. Your designer or architect would work this out to suit your project requirements.

Why the pat answer? Yes! Of course you work within your own space. When looking at the images on houzz you want to understand if it is feasible for your own project. You are getting the same question repeatedly because you are not answering the question directly. Very frustrating response. Why waste the time of repeating yourself.

Clothing closets are typically 24" deep + ±4 1/2" of wall construction. Allow a minimum of 36" aisle space between closets and any adjacent surface, whether an island or wall etc., ensuring that doors swing/open easily and freely.