Stripes and patterns are a great way to have a little fun with your outfit! Mixing prints is an easy way to create a dyanmic look. Stripes and polka dots pretty much go with anything, but if you're not too sure about how to mix up patterns and prints, the safest bet is to go with a bold print for the top and a smaller, more detailed print on the bottom.
Here are some examples of mixing prints:
Don't be afraid to venture into the world of mixing and matching! The more you do it, the easier it'll be to recognize what goes well with what. If in doubt, there's always Pinterest to help spark some ideas ;)