In order not to offend the cultural sensitivity of locals and to avoid steady gazes it is preferable to avoid over-indented outfits and T-shirts with obscene or provocative visual or text. Any other style of dress is tolerated.
Regarding professional dress code: jeans or pants, shoes, shirt or polo will do for boys. For girls the style is flexible as long as it remains professional and not too casual. You have the opportunity to directly clarify dress-code expectations with your Internship manager.