I’m getting marry; Dont know what to wear

So I’m getting married pretty soon. By the end of November to be exact my fiancé; father of mu daughter proposed to me on sep 1st. Long story short(Been together for almost 2 yrs, know each other for more 16 yrs. we have a 5 months daughter and a house) so we are abt to tie the knot. We just getting marry civil now and we’ll celebrate next yr. But idk what to wear. I want something Ivory, lace short and a little bit sexy. Not too much but something that can match my age. Pleaseee help!!