im 17 and want to wear footed onsies again how do i tell my parents this

https://www.misterpoll.com/polls/626651

I am a catholic teen girl and my parish highly emphasizes and stresses purity and innocence for teen girls before marriage.The Sacrement of Confirmation is done at age 16 in 10th grade.The girls have to wear a white,poofy,short sleeve,floor length dress and veil with gloves,lace anklets and white patent leather shoes.As part of the confirmation ceremony is the Rite of ReAffirmation of Purity and Innocence in which the girls pledge to remain pure and virgin untill their marriage.and they sign a form stating so.For the Rite the girls have to wear a white tee shirt with a pristine white cloth diaper and white plastic pants[rubberpants] under their dresses to enhance their purity and innocence for the ceremony. Confirmation is held on sunday morning mass,and the day before on saturday,all of the girls gather in the parish nursery and wear their diaper,rubberpants and tee shirt with a onesie or footy pajama and spend the day clearing their minds and becomming baby pure!