I don't think you can go wrong being well dressed. I had an interview where I was better dressed than my interviewers, I didn't really mind and as long as you feel good in what you wear then you don't have to worry about being over dressed. They did joke at the end that I should buy some t-shirts before I start! I am working at a place now where I was slightly more casually dressed compared to everyone else and I really didn't like that, although I was dressed fine I felt like a scruff by comparison. I would hate to be having an interview while feeling like that.

Even if the work environment is casual I feel for an interview you are better off just dressing smart regardless. Better to do too much than too little and if someone showed up to me for a hypothetical interview with a t-shirt of my brand I would always have this voice in my head suggesting they are just doing it to win points and are probably not genuine. Totally personal opinion though.

The usual advice I give is to dress one level above the daily dresscode. Game development is usually a casual environment, so "smart casual" or "casual+" is a good point to aim for. Even a nice pair of dark-colored jeans and a nice, inoffensive t-shirt is usually fine -- don't wear your favorite pair of jeans and lucky tshirt (old and both full of holes). Wear a nice pair of shoes to match, causal dress shoes are great -- wear your nicest sneakers if you don't have dress shoes.

Slacks or a dressier shirt might be a safer bet, so err on that side if you're concerned. In general, you're not going to gain or lose any points for dressing up, and usually the same goes for dressing down unless its so down as to be unprofessional. Don't wear anything that might offend, don't wear that shirt with the funny slogan on it, don't wear the thing with the stain or the hole, don't wear sandals, or a tank-top. Basically, common sense is sufficient, for those who have it -- if anything, dressing down too much docks you because it sends the signal that you might lack that common sense.

Rent a tuxedo if you want to stand out.

I have never docked points from someone showing up to an interview because they have overdressed.

Think this statement says it all.

Even if you are interviewing for a Junior position, dress as if you are for a very senior one. It shows a lot about you.

I think you have placed some good thought in your choices, but missed the fact it is business, people want to hire you to help the company make more money.

Dress like you are ready to do that and you should win.

I always wear my suit for interviews but that's mostly because it's one of the only times I get to wear my suit (the others being weddings and funerals).

But as others have said the games industry is normally quite relaxed so as long as you look smart and neat you should be good.

Out of your options I would go for the plain black shirt. Being well presented goes a long way in any industry.

Plain black shirt sound like a good choice. New clean cloths that you are comfortable wearing is the best. Don't matter if they forget what you wear, you are not there as a fashion model :).