Wedding Dress Pattern

It`s tradition in my family for my grandma to make the wedding dress. I found the dress that i want, but i haven`t seen any patterns like it. I would prefer it to be like this, only strapless, but alterations can be made. Anybody out there know anywhere else i can look besides vogue, mccalls, butterick, and simplicity? or does anyone know how i could suggest this style to them? i`m not getting married for another year, but my grandma starts on them early since i`m in college. Thank you so much for any help.