DP and I have rearranged our wedding for early next year and mentioned the colour scheme / choices to his family. Despite making it clear that the bridesmaids' dresses will all be navy, with various different straps etc., DP's mother has taken it upon herself to order a dress in the same shade that completely blends in with the shape and style.
AIBU in thinking it's not her place to dress like one of the bridesmaids? I expected her to want to join in having her hair and make up done with us (she loves to match her DD at any event) and am pleased we normally have that sort of relationship, but I thought the mother of the groom should wear something complementary to the overall colour scheme if not her own thing entirely!