How easy it is to hide the gun?

0 = You could spot it from across the street – drop leg holster, competition rig, etc.
5 = Normally hides well with only a button-up shirt over it.
10 = Go ahead and frisk me; you won’t find it…

No holster makes your gun invisible. However, proper design does help the shape of the firearm “melt” into you and be unnoticed unless grabbed directly (and not always even then).