I meant flip flops for during the day for walking around. Especially in university towns and in the south. I did not expect to see it at all.

Not at night time for clubbing. At night everyone is a lot dressier.

I personally don't dress like that, not that there is anything wrong with it, but it is just to casual for my taste. Plus as a tourist, I may be in a museum, then a church, then a fancy resturant for lunch... you want to be dressed for whatever comes up!