My FMIL got her dress. It is a very pretty purple dress. My mother found a dress she really loves and it also happens to be purple. My mom will not wear that dress though because my FMIL is wearing purple and she feels they would look like sisters if they wore the same color. They look nothing alike and the dresses look nothing alike. My wedding is black tie and my mom wants to wear a skirt and button down combination that does not fit the formality. Do you think I should bring up that I would prefer she wear something else since it is not as formal as it should be.
Mother of the groom's dress
Purple dress my mother likes, but won't wear
Outfit similar to what my mom already owns and wants to wear, but I don't think is considered black tie formal