You know the name of the game-- mix & match.
but my favorite take? the same matching pattern with some mixing....
To me, a striped shirt can go nautical very quickly (not that that's a
bad thing sometimes!) but when you want to feel a little less in the
safe, mixing up the scale of a stripe can do wonders
* you'll want to make sure there's quite a bit of difference is size of
the stripes if you are only doing two pieces of clothing...you'll just
look messy, if so >.<