How to differentiate original armani trousers from duplicate?

i have purchased an armani trouser at a very low cost say less than 1000/- and when i asked the vendor he said that they are the spare..i doubt whether its original or duplicate..the trouser has a small silver clip at the buckle where the trousers generally have brand names. describing it as GIORGIO ARMANI..so what is the truth?|||guessing from ur name, u must be an indian and must have bought it in India. In India, there are fake distributors with cheap quality cloth material. They print branded names in every way possible to make them a double profit. Must be a fake i guess.