Stripes on stripes

In the past I was pretty afraid of mixing two patterned items because there were some rules that in a look you should have only one pattern. As I have probably told you I believe that in fashion there are no such rules, you have to let you imagination fly and create the most unique outfits with it. For me they key of mixing patterns without making it look like too much is picking maybe the same pattern for the both items or something similar, like here where I chose stripes with stripes. But it can be stripes with grids, or you can go for something more unexpected like stripes with flowers but you should have one common element that connects the two. That element could...