It depends in which organization you are interviewing with. If you are interviewing with a company then be formal if it is a internship then accordingly.
Generally you had ask to wear professional attire. Avoid wearing too much dark outfits.
1. For men's
- it might be a suit with shirt and tie.
-Proper shoes
- wearing watch
2. For women's
- formal shirt
-If you prefer wearing skirts then wear a knee length skirts or you can also wear pants.
-Avoid using perfume with strong smell.
- wear fitted jacket. .jpeg&w=640&q=75)