You can say, "Mom, what are you wearing underneath?" You said, "Well, this is a little vest for girls." You smiled and said, "Can I wear it?" Your mother said, "However, it can only be worn on special occasions." You smiled and said, "Can I wear it now? Can you take a look at it for me? " Your numbness may look at you, and then, when she sees your chest bulge, she may let you wear it.