That's very funny, which movie is it from? I'm sorry I can't translate it for you, but dress for it=dress (yourself) appropriately/dress for the occasion. I hope that helps. Do you have some expression with vestirsi? I think this would be more along the lines of dressing for the weather, than dressing "up" (fancy) or "down" (casual).
I don't know from which movie it is, I'm sorry. And it was not a translation problem, I was looking for the exact sentence they used for the italian dubbing.
Anyway, I decided for: "Il nulla eterno è perfetto, se indossi l'abito giusto".
Thank you, mrg.
Eh sì, è un lavoro 'oscuro'..!
Anyway the quotation seems not to come from a WA's film, but from his book 'Getting Even':
Eternal nothingness is fine if you happen to be dressed for it.
(Getting Even, 'My Philosophy')