@Asiama
Too bridal in both colours, sorry! I know you said it's a gay wedding but you don't want to look like as if you want to marry one of them!
On what planet would anyone at the wedding think "she looks like she wants to marry her son/his partner"?!! Stupid comment.
I think both dresses are nice, but definitely only going to suit a certain figure - the woman modelling then! Just ask your son what he thinks. Regardless of how much he opines on women's dresses for such an occasion, I'm sure he'll be happy to see his mum wanting to look and feel at her best for her sons big day.
Only on MN would you be criticised for wanting to make an effort for your sons wedding. I mean, obviously you should pick something drab, blend into the background and don't dare look happy for them, that's just attention seeking!!