[hansjepansje]

You can start wearing a bra when you can do the pencil test.
Lift up your breast and put a pencil horizontally underneath it.
Then lower your breast over the pencil. If the pencil doesn't fall away, you can wear a bra.
But if I were you I would not bother. When you start wearing, the support tissue under the skin of your breasts can not develop, and your breast will be sagging all your life. Ligaments is the name of the natural support tissue.
I prefer the gentle jiggle and bounce of my breasts.