i also doing internship now.. on my first day, i applied for leave for the next day(my 2nd day work), because i want to send my father to KLIA.. i told my boss about the leave after he finish briefing me about the job, and he straight away approve it.. but he remind me, i need to have 75% attendance if i want him to pass my internship..

so, just try your luck.. mostly, boss wont be too strict to intern workers..

about attire, as long you dont broke the company law, then it is okay..