The photographers shoot on location all the time and they take the changing wardrobe situation into account; they usually have favorite places that they have shot previously that have bathrooms or other amenities to change in. That said the wardrobe changes are usually very simple and do not need to be overly dramatic to get the different looks. We usually suggest that gentlemen start with a button down and sweater or jacket and then lose the jacket/sweater and maybe change shirts. There is no need really to change pants as no one pays attention to what pants you have on. We’ve been doing these shoots for years and clients usually find that the on location shoot s are preferable and like any professional model that is shooting on location making minor wardrobe changes in a bathroom is not a big deal.