a Halloween's costume

I will attend a Halloween's party on Saturday this week.

I will have to dress up, but I wonder what kind of costume I'm going to wear. How about disguising myself by a typical American Mike Smith disguised as a typical Japanese businessman ? Then, I will just wear a usual business suit.

I hear American people are willing to wear an attractive costume not only children but also adults. The party is held by the Americans. One of person in charge said the party was the just the American party. I'm looking forward to it, though I worry about my costume.