Baffled!
IWB means inside the waistband.The knife(or handgun,as this is a common carry for sidearms as well.There are specific holsters for this carry.)is carried between one's pants & skin(or underwear,as the case may be)with the bulk of the weapon inside the pants & thus concealed by the waistband of the pants.When combined with an untucked shirt nothing is visable(the untucked shirt can be a giveaway to the streetwise,but with this being a common way to wear a T or sports shirt it becomes a case of"Is he or isn't he packing?"<img src="wink.gif" width=15 height=15 align=middle>.Common locations are crossdraw(in front of the hip on the weak side),appendex(in front of the hip on the strong side),just behind the hip on the strong side,or @ the small of the back(which I don't like:you cannot access your weapon while sitting & if you fall onto your back it's like you cracked your spine on a rock).IWB is a very effective carry if the knife can be secured:obviously the Spyderco clip does this.