I am having 5 women on my side of the bridal party. They are all close friends and family. One is a good friend of 7 years who will be attending both of her sister's weddings before mine (in close succession). Because her sisters are making her pay a lot of money total (Hawaii & Texas when we live on the East Coast), along with expensive dresses. Since I am getting married also quite far away in Michigan, would it be okay to make her an exception to our BP dresses?
Just a little background: one maid from high school, one maid is my fiance's sister, and 3 others I've known for ~6 years. I didn't choose a particular dress, but I did specify to my BP that I would like a certain color (sage green) dress and to stick to tea-length or longer dresses. My friend's dress will be a very dark emerald very long gown. I want her to use this dress to be in my BP, but would it be an etiquette faux pas to do this for only one person?