The key to create realistic render with any 3d software is a balance between good light, textures, 3d models and details. And context is really important to give your render a sense of realism. To achieve that we have to use detailed 3d models like this one offered by Juraj Talcik. At this link you can download some incredible 3d models of a wardrobe with five pieces of clothing ready to use. And it is not only the wardrobe; there is also a detailed bed model.
At first glance you will notice that all files are made for 3ds Max and V-Ray. But, for artists using Blender or any other 3d software, the author of the 3d model was kind enough to offer all files in OBJ format. Just beware that this is a high poly model with about 1.350.000 faces!