you can do it in 2 ways -

1. As shown in this picture - you can order the window with a privacy glass - look at the Viridian website for the options - they are a variety of costs. Viridian supply glass to most of the window manufacturers in Australia.

2. if the window is already there you can apply film to it. You can try this yourself (it is very tricky and takes a bit of practice but its doable) - just buy a roll of privacy film from the hardware and followi instructions. Or you can pay a window tinting company to do it for you. They do it very well and VERY fast!