^^ My husband has just said I'll look ridiculous coz it won't look right on me but hey what does he know??
Nothing. He knows nothing. This is a time for him to keep wallet open and mouth closed with the exception of effusive compliments.
Salwar kameez have centuries of history successfully making absolutely anybody who puts one on look fabulous. It is not likely that you will be the one to break this record.
I would highly suggest salwar kameez over sari, for one, salwar kameez is just more comfortable. Even if you get a very elaborate one, you will just feel like you are wearing embellished pajamas all day.
Two, sari takes some skill in terms of learning to put it on and work it.
Salwar kameez takes zero skill for either, you won't have to worry about your head, it will come with a beautiful long scarf called a dupatta, that goes perfectly with the outfit. When you need to cover your head, in the mosque or when presented to elders, just flip you up a chunk of dupatta and Poof!
The rest of the time you can wear it a squillion different ways. Easiest is just over one shoulder, one long end in front, one in back. Zero skill.
At the wedding, ask somebody and they will show you tricks for how to use it to work it and flirt with your husband.
And ask for an elastic in the salwar if you are unused to drawstring pants that have only a drawstring and no elastic. They will usually do this for you for $5 or so, or you can do it yourself, if you have skillz.
If you are used to wearing jeans, words cannot describe how delighted you will be with salwar kameez.
And yes, they are forgiving, you can eat lots, bloat up with PMS, even gain ten pounds, and no one will know, unless you get it made to be really tight, which sort of defeats the purpose and would not be a good idea anyway unless you know the wedding couples' parents are very liberal. Doesn't matter about the couple, the wedding, and everything and everybody in it, has to make their parents happy!