If I were speaking of three sisters, young girls, whose family name was "Holmsworth", I might say The Misses Holmsworth.
But if I were speaking collectively of Donald Trump's three wives, the present one and the two previous ones, how would I adopt a similar style? Would it be The Mesdames Trump?
Another question on the site asks a general question about addressing groups of people, but it does not specifically relate to the plural of Mrs.
Best Answer
According to M-W the form used is the formal but uncommon Mesdames:
For example:
Mesdames:
As shown in Ngram the usage of "Mesdames" has considerably decreased from the early 20th century.