embarrassing costume

When i was 15 , my younger siblings made me wear a back zippered pjs for trick or treating , i was in diapers for issues and after they made me put on the back zippered pj and they locked it , i was told to put on my white socks and white double velcro sneakers and they put locking mittens and a pacifier gag on me and covered with the pj hoodie and i had to follow them out , it was embarrassing and they were laughing and teasing me and people thought i was in costume as a baby , my younger siblings even introduce me as their baby brother even though im older than both of them. I tried to protest but my pacifier gag prevented me from doing so , my siblings then told me to cooperate else they would show my diaper photos to my friends , i didn't have a choice and i followed their orders.