In the example provided, the colon is used incorrectly in the sentence. Colons are used when introducing a list of actions or items. In this case, it is used to separate ideas, which is incorrect.
The correct punctuation item is a comma since it is used to separate ideas. The corrected sentence should be as follows: “he king ordered that all his subjects should show their allegiance through common forms of attire, yet many people continue to wear the traditional hats of their various regions”.