Girl's dresses for a wedding

Hey ladies! So we are going to my husband's friend's wedding at the end of the month. DD will be 3 months by then. I originally bought this outfit for her to wear, but I know the wedding etiquette is no guest should wear white on someone else's wedding day. I mostly got this because my husband is a groomsmen, and this matches his outfit (light grey, white and coral), and a lot of the other dressy outfits I find I don't seem to like much. It wasn't cheap, but now I'm second guessing if I should get a new dress so it isn't white! Do you think it's "no big deal" since she's only 3 months, and she'll have on a color cardigan anyway? 😁 Also take into consideration we may take the cardigan off if it's too hot, so she'll definitely be in just a white dress. 😬😬😬😬😬