I am getting married in June, my colors are purple and lilac. The bridesmaids will be in purple, my dress is in white and lilac.MOB is deceased, I would like MOG to wear a purple and lilac combination, she refuses ,she wants to pick her own color. I don't know what to do from here!
It is your fiance's job now to convince his mother that this is the right thing to do. But, she could choose a color like Champagne that would blend quite nicely.
Let your fiance know how frustrated you are and ask him to speak to his mother.