Here are some pics of my hair currently, so you'll see what I'm switching from (JRob you already seen this):
I CAN show some scalp, especially at the crown, if the hair isn't combed well there, but with toppik this isn't a problem.
Now, I'm not naive, I know that due to wind people might have noticed the hair at the front is very thin, and that I comb to disguise this thining. This is why I thought the piece should be styled with a ceasar look, this way I can use a base with a receding hairline (with light density at the front, maybe even extra light), and because the hair will be combed forward, nobody could really tell I'm cheating with a piece. Then when I go out at night, I can style it a bit less conservative...
The basic rule that I want to be guided by, is that it should be possible to believe my current hair pattern, could have transformed to the hair pattern shown with the piece.