Etiquette: The Blue Book of Social Usage by Emily Post, New York and London, Funk & Wagnalls Co, 1922/37.

When Parents of Bride are Divorced
Threatening to spread in an epidemic across the whole country from Hollywood (which is of course is given the discredit) to the outer circles of New York, there is at this moment a threatening wave of bad taste that reaches a climax in the invitation to a wedding sent out by divorced parents of the bride, together!
Mr and Mrs Oldhusband
Mr and Mrs Newhusband
Request the honor of your presence
At the marriage of
Mr Oldhusband’s and Mrs Newhusband’s daughter
Mary, etc
Anything more affronting to common decency than this, defies imagination. Even supposing the bride also to have been divorced, and supposing that the invitation to the wedding breakfast be sent out in the name of her own ex-husband, this completion of bad taste from every angle would add but little to the initial offense.
If we suppose, however, that the bride is a young woman who, like the majority of the children of the divorced, takes her own marriage with intense seriousness, the invitations to her wedding (quite apart from taste and propriety) are not very auspicious. We may know that her parents have been divorced and remarried, but to have our attention called to their shattered and rehashed pledges on the same sheet of paper that calls upon us to witness the solemn taking of these same breakable pledges by their daughter, would not seem to be giving the latter’s marriage a fair chance at the start.