Re: clothes for a wedding 
Omg I am sick to death of Anarkali frocks. They seem to be the go-to for the majority of pakistani girls. I personally despise those hideous looking things and have steered clear of them for the last few years.
The long frock/dress/kameez with a sharara underneath seems to be one of the latest trends. You can also alter it and make it looser for your stomach. See below
Also, long maxi dresses (the pakistani styles one) look nice. I know a few fat asian aunties who wore one to weddings and they looked super classy and not at all accentuated their fat stomachs. In fact, it hid it quite well. Look at pic below.
http://static2.shes.pk/imgs/2015/02/Pakistani-Bridal-Maxi-Collection-2015.jpg
Also if you do decide to wear the lehnga choli you can drape your scarf in such a way that it cover the stomach area