I am attending a wedding in September. The wedding is in the morning and the reception is at 8 pm the same evening. The invite requests formal clothing - dresses/saris for women ( Indian groom, Greek bride). Is is ok to repeat the same outfit or should I plan on having two separate ones?

The venue is a Waldorf Astoria. Right now I don't have anything that fits and it is unlikely that I will be able to stay through the entire reception because of my toddlers bedtime which makes me somewhat reluctant to hunt down a second outfit. Skipping the reception is not an option (old family friends or my parents and we are part of the small contingent from the grooms's side who can attend the US wedding).