This wedding dress mostly wears in foreign countries. Most the women like to make the dresses of big sizes because of their pregnancy or other issue like they want big size dress that can appeals to every one. So the reason behind it. But in Muslim countries like Pakistan and India this is not very famous like other countries.
And one most important thing is that this is not affordable for every one. And especially in Pakistan there is not any huge concept of big size dress.
But it can be possible if you want to go in wedding or any function you can wear it. But you have to do lots of practice for it. Then it will look good on you. And you have to be confident that you can carry it.