Breast implant visibility: golf and volley balls versus silk sheets and comforters.
I know this is a crude example but it helps to make the point. If you hide a golf ball (implant) under a silk sheet (tissue), the appearance will be very ball-like. However, if you hide the baseball under a thick comforter, the thickness of the comforter will greatly influence the result. A very thick comforter may make the ball barely visible. The comforter will determine the overall appearance of the result. If you change the golf ball to a volley ball, it may appear more round.
In individuals with very little tissue ( thin athletic women with low body fat and an A cup breast), the breast implants may be more noticeable and will ultimately have a significant role in determining the appearance of the outcome.
In individuals with C or D cup breasts, the overall breast tissue and position of the gland will have a greater effect on the overall appearance of the final result.