My FI's sister is lesbian, and I want to include her in the wedding party. His other (straight) sister will be a BM, but I'm not sure what to ask his gay sister to do. We are pretty close friends, and I would love to have her as a BM, but I don't want to make her uncomfortable. She said she would wear a dress if I really want her to, but I want her to feel comfortable at our wedding. I've read some ideas that either she can wear what the GM are wearing, or maybe pants and a shirt that matches the color of the other BM.Or I could ask her to be an usher. What do you all think?