I've got a little
bit of experience in video interviews, here's my two cents:
-For any position below "upper" management (ie: carp, TD, designer, a2, electrician
etc etc), a polo is about as formal as you need to be. I've worked at some corporate venues where even the carps and box pushers wear polos as their uniform. A t-shirt may make the interviewer wonder about why the applicant isn't putting their best
foot forward, maybe not. I would go for a polo.
- you're trying to sell your self, so take some time to make sure you're looking good on the camera. overhead lighting in front of you is better than 1
desk lamp to the side and behind you. People look better when viewed from slightly above, put some books under your laptop to get the camera higher.
-look at the camera, not the
screen! In our western culture, it would be off-putting and kinda rude to have an in person interview and never look the interviewer in the eye. Same applies for a video one.
-shut off any alerts/notices on your computer before the interview. Just like you'd silence your phone in an in person interview.
-get set up before the interview and
call your friend to check your connection/trouble shoot IT problems. The day before one of my interviews I skyped my friend to make sure everything was working. Next day I moved my computer to an uncluttered part of my apartment and called in for the interview. Couldn't get the video feed up and running at all, just had some bad quality audio. Turns out I had a wireless dead spot in that particular spot in my apartment. It made for an awkward interview, and we ended up switching to the phone. Moral of the story, test out your tech before in the interview.