My brother is from IEM Kolkata, so, I can help you with this. The dress code is as follows.

• Grey trousers and a white shirt with the IEM monogram on the pocket.
• Dark navy blue tie (Optional for general days)
• Black shoes (any sneakers with a decent color are also acceptable but no chappals).
• It has an official blazer for winter, but you are free to wear any sweater or jacket you want.
• Kito shoes are also permitted on rainy days.
• They now have IEM bags and belts as well.

The dress code at IEM is very strict. You must maintain that from first to final year.