Wedding guest outfit, not a dress what can I wear?

[Greenstar22]

I'm a size 12/14 5'3 with a bit of a belly!
I hate dresses, heels and generally live in jeans.
I have to go to a wedding and everyone is wearing dresses, quiet a formal wedding.
What can I wear? My legs are short and stumpy but if I wear trousers what kind of top will I wear?
I also have back problems so I usually wear trainers, dm, brogues.
Please help me, I'm also on a bit of a tight budget so under £50 ideally

I tried on the lipsy jumpsuit and it was so long i looked like a clown. I'm only 5'3 so might try co ord in petite

wow....so rude!