No, there is no such dress-code in IIT Bhubaneswar. But there are few basic rules regarding dress code like other colleges IIT Bhubaneswar expects the girls to follow. You should not attend the classes wearing something which may be perceived as inappropriate for the classroom environment. Other than that girls are free to wear what they want in the hostels.
But, there is a certain dress code for certain events in the college. In convocation, IIT Bhubaneswar asks its degree recipient to maintain a proper dress code. The dress code for girls is Saree with Golden Border/Churidar of Offwhite or White or Cream Color. For placements, the girls are always asked to be in their formals. The formals can be in the form of Churidar / Saree / Blazer with shirts tucked in, etc. Since jeans are not a part of formals therefore the girls are not allowed to wear such during such events.