
Don't be a slob, don't be promiscuous, don't wear clothes with controversial statements or symbols. Office casual is a good option, because Blizzard is very casual (t-shirts and jeans is common), but dressing up just a bit more shows you care. Full-on suit and tie is probably overdoing it, but it wouldn't count against you. If you wear something gaming-related, expect it to come up as a topic because we're all nerds who look for the easy ice-breaker, so pick a game you have passion for.
Your favourite clothes! Obviously be clean and tidy, but however you feel most comfortable!
Whatever makes you comfortable, but obviously present tidy and respectfully.
Whatevers clever
Casual business
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