Wedding outfits dilema....

Zara: Will I ever wear it again?
Topshop: Too much like a wedding dress?

ASOS: I like this one

ASOS: Id be able to wear this again and both as separates

ASOS: Too casual?

So, I have a wedding to attend in 2 weeks and I'm stuck on what to wear. Help!

I always go for dresses so was maybe thinking of a trouser suit, but will the many trouser suits that are about at the moment which one do I choose? and will everyone be wearing florals? and do I spend loads of money on a pretty dress that will most likely sit in my wardrobe never to be worn again?

Ive literally no idea!