You can't go wrong with a pirate blouse and a pair of old jeans.  The perfect cool and comfortable outfit for touristing in a city in summer. If it's extra hot I wear gladiator sandals, but trainers look great too. I buy old Levis and then cut them with scissors in lines to creat the basis of rips. Then you just wash them a couple of times and the distressing opens up. Sometimes I get them tailored too to fit my thighs better.