UPSC

Hello,
As your main focus is on UPSC, you can opt for any minimum level graduation. The basic requirement of UPSC is to have a bachelor degree. Which degree do you have doesn't matter for UPSC. So, you can opt for B.Com or BBA as these are the minimum level graduation which requires only 3 years. Further these courses don't put so much pressure on students. So, you can easily prepare for UPSC as well.

If job is your first priority, then it's advised to gain some work experience. Later, you can prepare for MBA/ UPSC exams. Though, there are a lot of people who simultaneously work and study for these exams and score good. However, it requires proper time management and immense dedication.
Good luck.

You are eligible to appear for various examinations conducted by UPSC provided you have done Bachelor degree course in Fashion Designing from a recognised Institute.

I am little confused by your questions. If you are graduate, you are eligible for UPSC exam or for pursuing MBA.

Any graduation course is eligible to appear for UPSC exam. You can choose any graduation course according to your interest like B.Tech, B.Sc, B.Com, BA, BCA, etc.

You are eligible to appear for Civil Services Examination conducted by UPSC based on your educational qualifications.

As you already know that to attempt UPCS exam you need to be a graduate. It doesn't matter in which field, whatsoever. So, I will suggest you to have a graduation degree as per your convenience in whatever field you like. As you are mainly focusing on UPSC, I will suggest you to opt for a small duration graduation course like of 3 years.