Hmmmm, I tend to dress more causual and my husband would never wear a suit on holiday. Khakis, black jeans, casual slacks, ect... always work. Jeans are fine but probably not worn as much as here in the States. Tennis shoes, jeans and t-shirts seem to be the American uniform but plenty of my British friends wear the same thing. I have started to leave the blue jeans at home and just go more casual but not dressy. Black always works no matter where you are.