Plain shirts are the most versatile, making them the easiest to combine with a range of different ties. Try the following:
Striped shirts provide a smart way to bring pattern into formal outfits. But some ties won't work with these shirts, particularly if they also feature stripes. Try one of these:
Another favorite pattern, checks can appear more casual than stripes on business shirts. Smarten them up with one of these ties.
There are a wide range of patterns to choose from for both shirts and ties. As a general rule, make sure that the designs are clearly distinct from each other. Here are just some of the ways: