well my cousin is wearring her bridal on my shadi. she'll probably end up wearing her jewelery as well. the clothes wll be similar since they're by the same designer. she asked me and i obviously told her to wear whatever she wants.
i dont think anyone's trying to outdo the bride unless they're like messed up in the head. its just that girls spend so much money, time and effort on their bridal dress so they want to wear it whenever they get a chance which is like hardly ever.