Hello aspirant,
Minimum eligibility for the Undergraduate course in this field is 10+2 with 50% marks and for Post Graduate courses graduation. In the prominent institutes, admission is strictly on merit- through written test, situation test, group discussion and interview.
These courses are aimed at understanding concepts related to costume, jewellery, leather goods and many other similar products where fashion matters.
The courses includeGraduate, Post graduate, Certificate and Diploma in the following areas:

Accessory designing and fashion designing
Garment Manufacturing Technology
Apparel marketing and Merchandising
Leather and Garment Design and Technology
Knitwear Design and Technology
Textile Design and Development
Fashion Journalism and Presentation

Prominent institutes in Fashion Technology are National institute of Fashion technology (NIFT), National Institute of Design (NID), International Institute of Fashion Technology, New Delhi (IIFT); IEC School of Art and Fashion, New Delhi; Indian Institute of Art and Fashion Technology (IIAFT), Mumbai; Pearl Academy of fashion, New Delhi; J.D Institute of fashion Technology, New Delhi.

All the best.

Hi dear,

Hope you are doing well!

Now let's go through your question.

As you will be knowing that a fashion designer needs to fulfill both fancies and the materialistic needs of the customer and accordingly satisfy the customer in best possible manner.

The minimum eligibility for this field varies as per the course.

To opt for undergraduate course, a person needs to be complete with 50% marks.

And if you opt for a graduate course, you can opt for any institute only if you are graduate in any stream.

NOTE:

There are many programs that takes at least for 4-5 years while some program are for 3 months.

Thank You & All the best!