Cora C. Klein, Practical Etiquette
“ A formal invitation to a house wedding demands the same acknowledgment as an invitation to a church wedding.In acknowledging an invitation to a wedding, a single woman sends one of her visiting cards in an envelope addressed to the mother and father of the bride on the day of the wedding. A single man sends two of his cards, and a married couple send one of the wife’s and two of the husband’s cards. To the bride on her “At Home” day, cards should be sent in exactly the same way. A wedding reception, if it takes place in the evening, demands full dress. ”
