Vanessa I can stop wearing it when I want,but I would have to leave,and it would break the relationship with my parents.
Would it really though? A parent's love is unconditional. It may not seem that way to a child, but you are the product of a lifetime of hard work and dedication. Sure, they might be disappointed... But severing ties because you won't wear their favourite underwear? Seriously?
My bet is they would miss you terribly the moment you disappeared from their lives. It's just a perception of power that keeps you there. Flip that on it's head and they would start questioning their parenting methods pretty damn quickly.
And if they really would block you despite you being a well adjusted, capable adult... well then you should probably start asking yourself if it's worth hanging around for that kind of relationship.