I'm getting married for the 2nd time. Many friends & family have agreed to help us by doing special little duties on our wedding day in lieu of gifts . They've agreed to wear formal attire within the color scheme. My Aunts in floor length beaded Plum gowns. They will light the candles at the beginning of our ceremony. My best friend in a formal creamy yellow gown that has plum & pink flowers on the bodice and will greet our guests at the door, guiding them in the right direction towards the ceremony area. I would like my older sister to help out by handing a ceremony program to each guest as they enter the ceremony venue & help direct them to their seats. THE PROBLEM IS, my sister is refusing to wear anything I approve of. I just want her to look decent on my special day. I've even offered to buy her dress for her. She wore an unacceptable dress to my first wedding & it was embarrassing. I'm thinking of inviting her just as a guest & not have her do anything special. ANY THOUGHTS?