1, according to what you said, the "sister" your classmates asked you to be should not be a bridesmaid, but a member of the "sister group". Sisterhood group is the friends and sisters who have a good relationship with the bride to accompany the bride, help her make up and decorate the room. The main job is to make it difficult for the groom to get married. Launching a program to stop the groom from "squeezing the door" is also called "blocking the door" or "robbing the door"

Being a sister is actually the same as other guests, but it means getting closer to the bride. Therefore, you can send red envelopes or gifts according to the rules of your hometown;

According to the custom, when the bride gets married, the bride and groom should not accept red envelopes, but the sisters accept the red envelopes given by the groom when he grabs the bride, but the picture is lively and the face value of the red envelopes is not big. Red envelopes can be given according to the custom of hometown, usually at banquets.

Since the bride said that there is no need for formal dress, there is no need for deliberate preparation. But after all, the wedding is a grand occasion. It is recommended to wear a slightly formal dress or suit, at least with a collar, sleeves or small clothes with a certain sense of design. Don't choose black and white. You can choose pink, orange, lavender, light blue, grass green and so on. And avoid yellow, because the word "yellow" is taboo in some areas. If you choose black and white, you should also avoid large-scale use. You can use it as an ornament, such as a pink coat, a black tube top ... a long white dress, a blue coat and so on.