Okay so I made a pretty awesome cabled hat (first time with cables), which I can't wear because it came out ginormous ! Is my head just freakishly small?!..gauge was correct, followed instructions...meh...or it might be that with my short hair I need to looking for different style hats...
What yarn and needle size did you use? If you used a different weight yarn or changed needle size it will affect the size of the hat. If you used the same needle and yarn then you may be a loose knitter and you might need to go down a needle size or two.
When asking questions ALWAYS post the name and a link for the pattern if you have it.