Pretty much exactly how I would dress if: 1) I had a shoe / handbag budget, 2) I had skinnier legs. BUT! Most of this look is still easily achieved on a budget (how easy is it to find a decent, second hand, gray men's jacket, esp. if it doesn't have to fit?) and I think gray trousers could still look striking here.
If I were to be the designer of clothing, I would need to pay attention to the audience. My audience would most likely be people from the ages of 20-30. I would hand design these designs and then send them to a manufacturer and then sell them to high end stores. I would promote my designs in fashion shows. I would make evolutionary prototypes. I would make rough designs and work on them until they were perfected.