Hi sayanti,
Fashion design is a subject and field of clothing and it's designing.
If you choose the philosophy, economics and geography , they are not relatable subjects with this field.
These subjects will not be useful for you in future, if you want to go with fashion designing.
In fact , this course need skills of creativity and hands. You can take side courses like chemistry which will help you to understand the composition of the fibres, you can learn stitching which is a must for fashion designing students.
Take those subjects which can be linked with your subject which you want to pursue.
If you are interested in the above courses mentioned in the question you can only take economics because in, future if you want to setup your business that will be helpful for you at that time.
Or if you are more interested in the above 3 subjects you can go with them but still have interest in fashion design you can do diploma in it.
All will work , just you have to mix up the ingredients correctly.
All the best!