A good quality clown shoe will last you a lifetime. They are an integral part of your clown costume. The outside size of your clown shoe should be determined by your height, weight, costume and what you do as a clown. Consider what you do when ordering your clown shoes. Is your clown character clumsy? Or do you juggle? Or do you just walk around? The many sole shapes that are offered, will help compliment your costume. Shoes should complete your costume, you want people to look at you.
If you are new to clowning, and are still trying to "set" your character be a little neutral in your color choices for your clown shoes. Or pick colors for your clown shoes, that you are going to incorporate in your costume.