For a procedure like this I’d recommend strongly that you consult with a board certified plastic surgeon with quite a bit of experience in augmentation and cases of tubular breasts. You’ll be able to do a physical examine and determine what specifically your best options may be.
Generally, tubular breasts require a surgical release of the lower breast. As a result, there is often not a lot of breast tissue covering the implants. Since saline implants have much more visible rippling when there is thin tissue coverage, I recommend silicone breast implants for most tubular breast augmentation patients. Again, consulting with your surgeon is important as a first step… then you can map out your game plan.