Dont worry , you can do diploma in fashion design after 12th , after 12th there are many way to became a fashion designer . Because after 12th you can go for as well as bachelor degree too which is give you graduate degree . You can also go for diploma then you can go for bachelor degree.

Eligibility for Diploma Courses:

For admission in Diploma courses, students must have completed 10+2 level from a recognised board in India with not less than 40 - 50 per cent.

For more information about fashion designe you can visit below link

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

Thank you. All the best. I hope this answer helps you.