aisha i was just answering ur question.i thought u want something very different.
No, it is not necessary, but lehanga/gharara/sharara gives bridal look. One of my relative wore sharara on her nikah day, so on her wedding day she wore red hyberabadi khara dupatta suit with heavy kaam, she looked gorgeous in that dress.
moazzam i am a pakistani! ... desi ... subcontinental girl! ...
really jia that is nice to know .. am sure she must have:)