395cc Implants a Good Choice for a Full C Cup?

A 395 cc implant will more than likely get you to the size that you want.  As for the "fake" look it would be hard to tell without examining you in person.  Bra size however does not always correlate with the volume of the implant, and implants of different sizes look different on patients with different body dimensions.

The answer is not to start with the number of cc's but to start with what width or diameter implant will fit the width of your breast and then pick a profile that will get you where you would like to end up. If you are between an A and B cup and you choose a high profile smooth round gel (Mentor or Allergan) or high profile saline (Allergan, not Mentor), you will look about two cup sizes larger which would put you between a C and a D cup size. There is no good way to measure this exactly in terms of size and cc's are relative, not absolute. There is also no way to use external sizers to determine this or show you exactly what it will look like. By definition, D cup size breasts are out of proportion and can look fake and the shorter you are the easier it is to look top-heavy even in a full C cup. Go with what you think will look best for you rather than what others think. 

The implant has to fit if it's going to look natural and you want to know what you're starting with and what effect the choice of forward profile will have. Start there rather than cc's or what choosing a resulting size which I compare to choosing your dress size number before you get measured.