What Should They Wear

With all of this free time right now, my fiance and I have been discussing what we want our bridal party to wear. Our colors are black and purple. I don't really like guys in purple so we agreed the groomsmen would wear black tuxes with a white shirt and black tie and vest and the bridesmaids would wear purple dresses. I am having a bride's man and he is having a groomswoman and we can't decide what they should wear. My fiance is leaning towards the groomswoman wearing the same dress as the bridesmaids, but I think she should wear a black dress to match the groomsmen. My fiance's reply then was "Does that mean your friend (the bride's man) is going to wear a purple tux to match the bridesmaids?" To which I said no. I thought he could wear the same tux as the groomsmen, but a different color vest and tie. My fiance is also against the black dress because that seems like something she would be going to a funeral (his words not mine). Any suggestions or if you had a bride's man or groomswoman or have been to a wedding that has had one what did they wear? We haven't officially asked them to be in our wedding because we wanted to ask in person, but they pretty much know that we want them to be in our wedding.