There's something playful about dots - they always look cute, a bit over the top and if they are big and bold enough, they can come of as a bit theatrical. That's why it's a good idea to tone them down by pairing them with jeans. Jeans is a universally casual material, and pairs perfectly with dots and other strong prints.
Looks best if you chose a jeans overlay - pick up that jeans jacket you surely have in your closet, or that casual-cool jeans west, and you are good to go.
Do you like wearing polka dots? What do you pair them with?