My Izula or any other fixed blade goes in my right pocket when out and about. I don't need any drama about having a knife, after all. When at home or out in the woods though, I sometimes wear it on my belt or with the sheath thrust through a belt loop. I find the belt loops on all my jeans hold a properly sized sheath extremely well.
Izzy - RF pocket
HEST - usually hangs out in my gethome bag, otherwise, clip it to my belt with my RC5 clip plate
RC5 - I have the MOLLE-back setup and will hip carry it, or use my Armorall-custom leather in scout carry. (Usually, the 5 stays home, unless I'm going out in the woods)
I keep my Izula in my back pocket or clipped in my front pocket in a little kydex sheath I made. Sometimes I carry my rc-3 instead, and that goes on the belt but usually clipped into my front pocket with 2.5" of handle protruding, also in a little kydex project. Never felt comfortable with horizontal carry, my shirt hangs up on the pommels or they just stick out and are obvious. Probably ought to try making a sheath for that purpose.