Depends on his age quite a bit. If he has left home or is an adult then leave him to it. If he is a child or still at school then tell him that he should not wear them outside of the family home for starters. Cross dressing is more common than you would expect and normally harmless. If there is more to it or signs of something else wrong then you can get advise from the doctor in the first instance.
The make you breasts look bigger but they do not make your breasts grow bigger.
You can't make your breasts grow bigger and faster. Your breasts grow as they are meant to and there is nothing you can do to speed-up that process or make them grow bigger.
Caressing your breasts will not make your breasts bigger. One way to possibly increase the size of your breasts is to gain weight.
Massage does not make breasts bigger. Female hormones do.
Some women get bigger boobs after child birth and some women get smaller. There is no way of knowing before hand.
No,
No it does not. But making milk yourself (lactation) does make your breasts bigger.
No foods make breasts. Estrogen made in the body does.
Yes massage your breasts with olive oil,
NO.
No
No it can't