Is there is a uniform at NICMAR?

Just like any other B School, the dress code for classes is FORMALS.

For the classes, casual formals are acceptable. Semi-formal trousers and shirts will also do. It also depends a lot on the professors. There are some professors who are very particular with the dress code while for others it may not matter. 

But for your own good and preparing yourself for the industry, you should try and adapt to wearing formal every day for classes.

To add to the point above, during the placement process, a strict formal - White Shirt and Black Trouser with a Tie are mandatory.

Moreover, it sounds very difficult but with time you will get adjusted and it won't be a problem anymore. And while on campus you will have bigger problems at hand than just thinking about wearing formal for classes!