My sister and I do dog shows and need to put on show clothes in the morning (both of us). We just keep the window curtains closed when we get up for the morning. One of us has our clothes up front and one has them in the bathroom shelves. The one with clothes in the bedroom showers first and then changes while the other showers and that person can change in the bathroom or the bedroom (we have a somewhat bigger bathroom than you). Or we can both change in the living room at the same time. we try to coordinate and put our clothes out on the sofa or bed so that we can just grab them and go to another room to change if needed. We get the main stuff on first and then curtains can be opened and then finish up with socks, shoes, accessories, etc. When we change after the shows we just pull the curtains for the main room and both quickly change in there (unless there are a lot of people about or close you don't really need to pull the curtains on the smaller windows
). and like most people mentioned who's really going to be looking into tt windows.