I searched and found some info on this stupid question I have. But, wanted to be clear.

I know I will stand out as a tourist just due to my American (New York/New Jersey) accent and by the fact that I will be walking around with my mouth wide open and taking lots of pictures. So, I'm not worried about my shoes making me look like a tourist. But, are sneakers just in bad taste? I mean I don't want to offend anyone or really look bad or bummy. There is a Campers shoe store right by me here in Los Angeles. I was thinking of picking up a pair. Is that a better idea - wear those instead?

And what about clothing in general. Jeans and T-Shirts ok? I mean I'd dress up more for a nice dinner, but I mean just walking around or hitting a museum or out for Tapas, would I be ok with just jeans and a t-shirt? I've also read baseball caps don't really fit in over there too. True?

Any other clothing tips? Sorry, I'm a first time visitor and I think I have OCD - lol.