Abstract: A method for selecting a properly sized breast implant by first providing a breast ruler, at least one pair of flexible, fillable implant devices, and a liquid measuring device adapted to fill the implant devices. Next, the breast ruler is placed over a breast of a user and a breast width is measured. Then the liquid measuring device is used to fill the implant devices with an approximate amount of liquid corresponding to the earlier measured breast width. Then the filled implants are placed over the breasts with an item of clothing. Finally, the amount of liquid in the implant devices may be adjusted for the desired breast size and appearance.