Purim Costumes

I'm a little concerned over these halloween costumes:

(Grecian Adult Princess Costume)                       (Athena Adult Plus Costume)

From what I remmeber from Jewish school.. Purim has nothing to do with anything greek. Where Esther, Vashti, Haman, or King Achashvairosh?... or the ever-popular Hamantashen costume?

As a Jewish person, am I supposed to find this offensive?