What should I wear to a pub in a poorer western suburb at night?

I am going out with some guy friends who are like brothers to me, next week, for the weekend. I am wondering what the usual dress code is for Western suburbs where people are generally a lot poorer than where I live? During the day, I see most of them walking around in light hoodies with loose pants and no jackets. One of my friends lives out that way and I don't want to stand out like a sore thumb, as I'll be going there in the evening, then I'll travel back to a slightly poorer area to catch a night time bus home.

What should I wear to a pub in a poorer western suburb at night?
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