Taping to create cleavage

This will give women with small breasts more cleavage than is possible with a push-up bra. Obviously a push-up bra is much more comfortable so you would only do this if you needed more cleavage or if you were wearing something you couldn’t wear a bra with. This method is also used by transgender women to give the look of real breasts without having implants. You will be taping across your chest to push everything up so you will need to pad out the bottoms of your breasts to make them look full. The easiest way is to pad a bra but if you aren’t able to wear one you can tape the padding on.

Source: http://ultimatebraguide.com/bras/taping/