Activity for Sarah

My brides dress is an ivory ballgown with off shoulder sleeves (i'll find a picture to post) and im not sure how to matcch my dress to hers. Do we coordinate colors? Do we find similar styles? I dont want to clash, nor do i want to look tacky....

We have100 guests. my fiancee wants to cater herself, andmy aunt is making the cake. we want to have te ceremony and reception at the same place. any help yall can give woud be marvelous