Wow

thats a cool question, I think it is possible, but it would not be easy to do, never thought about installing wordpress on a flash drive, at a minimum you would need the right kind of environment on the drive.

U3 might be a possibility, I know I can output on U3 but providing the test environment that is a different story, this requires some additional thought,

If you are female: I'd wear nice slacks or a conservative skirt, and a nice blouse. As this is a creative job maybe wear something quirky (a courderoy jacket?) and definitely try a pop of color, either in your blouse, or your shoes.

If you are male: wear nice shoes, pants and a button down shirt. you could wear it with a sweater over it, with or without a tie. but again if possible be memorable. either with the fit of your clothes, a strong color, a tasteful bow tie or other accessory.(ie I would wear my artsy glasses rather than go with contacts)

Basically be fairly dressy, but memorable. Even if you're more dressed up than everyone else they will still see that you are serious by the fact you took time to dress up.

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Hope this helps!!!