I haven't been to a wedding for a very long time. I'm now 40. And fat.
I have a possible dress, but it might be a bit evening looking. I've looked at other people's photos on facebook of weddings they've been to, and they tend to wear things that are shorter, often with jackets, and I don't know if this is more ball-gown that is suitable. I have very large calves and thighs, so really I need something that is mid-calf to be comfortable, and the choices seem to be very informal summer dresses/skirts at that length (I'm quite short), or evening ones.
I put a photo on my profile. It's got sequins around the straps and neck. Fitted under the bust, then drops to mid calf, silky. I got it in a massive sale but not quite sure what it's for. I'd wear some kind of shrug or shawl I expect. I dont think the wedding is very formal (registry office, village hall). I like to blend in and not be noticed much, and don't want to turn up wearing something over the top, but yet also want to not feel too frumpy.