I'm trying the set-up, right now, with a leather dress belt (the most comfortable belt I own) and a Bianchi Blackwidow with my Colt New Agent. The only position the would be "tuckable" is just behind my right hip. Even that position would require a sufficiently bloused shirt.
The 12 o'clock position is the most comfortable for me, but there is no way for me to wear it with a tucked shirt in that position. Crossdraw is also a problem.
Do web belts of sufficient strength come in white? I often wear a white shirt and may actually end up wearing the belt higher than my pant waist. Of course this may necessitate a white holster and gun, too.
If nothing else, this gives me some ideas about what to look for in an IWB holster.