The internal depth of a wardrobe (from front to back) should be 18" (46cms.) if it is intended for everyday use.
We can fit hanging rails as required.
The internal drop for hanging clothes needs to be around 38" (96 cms.). If you're thinking of economising on space, then with one rail above another for shorter clothes (shirts trousers etc.) a minimum internal height should be 72" (183 cms.).