I was in Spain in May and it was very hot.....for fear of looking too touristy, I went with a skirt instead of shorts....I just dressed up a little bit more than I would here in Canada and it worked...no t-shirts, but nice feminine tops and accessories I find really help....as for my husband, he wore 3/4 capris and he fit right in! My Spanish friends wear that with a nice pair of Puma's and a sporty t-shirt and they fit right in!! Spaghetti straps are ok for women....just try and jazz it up a bit with jewelry......have fun!