Hi, hope you are doing well.

In order to do business after diploma in fashion designing, you need to follow these steps:

1. Improve your skills through internship opportunities with fashion houses, clothing manufacturers or designers.

2. You need to understand the business aspect of fashion designing.

3. Prepare a portfolio to showcase your finest work.

4. With the help of fashion magazines and websites, you should always keep up with the latest trends.

5. You require skills like excellent drawing, an eye for detail, understanding of fabric, texture and colour, ability to visualise and good communication.

For further information, please refer go thus link:

https://www.careers360.com/courses/fashion-design-course

Hope this helps.

Best wishes