Design

Weapons engineering is a specialty under mechanical engineering. It is a branch of study that deals with the research, development, production, repair and maintenance of weapons and other artillery associated with it. As a weapons engineer, you will have to deal with a collection of equipment, structures, vehicles and communication systems which are specifically designed for warfare.
In order to become a weapon designer/engineer, you should
1. Complete your +2 level with good marks in physics, chemistry and mathematics.
2. Appear for the entrance examinations for a 4-year degree course in mechanical, electronics, metallurgy, electrical or chemical engineering.
3. Sit for the postgraduate entrance examination specializing in the weapons engineering at the postgraduate levels.
The best colleges to study weapons engineering in India are as follows:
Defense Institute of Advanced Technology, Pune, Maharashtra
Institute of Armament Technology, Pune
College of Military Engineering, Pune.

Hi Sagar,
I think, you should go for Fashion designing if you are interested. One should always work in the area or field which they are interested in.
And fashion designing is all about apparels, from their sketches to their construction, embroidery to their pattern, production to sales, photoshoot to marketing, exhibition to fashion weak.
It doesn't matter that how much you know about fashion once you start the course. They will teach you different aspects of fashion and designing garment.
NIFT (National Institute of Fashion Technology) is the best college to pursue for Fashion designing in India. It's a government college which offers Bachelor's programme as well as master's programme and the short Diploma course. You can choose any of the programme.
The eligibility criteria for these different programmes are-
1 - For B.Des, you should be under 23, with a score of 55% in your 12th class in any of the stream. (For SC, ST and differently able the age limit is relaxed by five years)
2 - For M.Des, you should have a minimum 3 year duration degree in design from a recognised college.
3 - For Diploma course you should be 12th passed.
All the best!