It's a Texas tradition. On homecoming many girls wear mums. These are the mums that belong to this year's cheerleaders. Usually the mums are in the school colors. When the girl is a senior, her mum will have three mum flowers and usually be white and silver, although I noticed that this year several had a bit of color as well. These are actually worn by hanging them around the girl's neck. Everything's bigger in Texas and homecoming mums are no exception!