What is the difference between 1-year Diploma in fashion designing and 2 years Diploma in fashion designing?

Duration of most Diploma courses is of 1 year. However, advanced Diploma courses may take a couple of years to complete the course i.e. 2 years course. A Diploma course is a short-term programme designed and structured to train and educate students in a niche topic that can be studied independently.

I am not sure, but maybe one year Diploma must a part time course and a two year Diploma must be a full time course. I would suggest you, if you are really interested in fashion designing, then you should do a full time Diploma course in fashion designing.