I have a beautiful A-line thigh length champagne-ish cream colored vintage dress with a scoop neck, very short sleeves, and a gorgeous pink and gold paisley embroidered design (it's probably cotton, and looks handmade). It's not too far off the color scheme that my fiance and I are considering (blue, champagne and white), but it's a little informal for a wedding gown. Our wedding is in a year, so I'm still exploring options, but I thought maybe I could lengthen the dress and make it formal-ish? Doesn't need to be tea-with-the-queen formal... but something I can look back on without cringing.

Will the pattern make it impossible? I can add about an inch and a half to the length no problem, the last owner took up the hem rather messily so ripping out her seams won't be an issue (most of it has already come apart), but it'll still be short. Would using cream colored tulle be tacky with the length, or should I take it up to hip level and add a full skirt?
Once I finish attaching a new zipper, I'll upload photos.