I've tried this, although I am 6'1 and 200 lbs. Here is what I have found. I bought a Mernicle P6SA for belt carrying my NMBH .357. The gun is heavy and if you have no butt to hold up your pants, they will be dragged down. A pair of suspenders would help. The butt of the gun is the most troublesome because it prints, but it doesn't matter after your pants have fallen down.
Seriously, though, wearing the gun IWB with the butt of the gun at about 1 o'clock and the barrel angling toward your left pocket is the best way I've found to carry the NMBH concealed. The only trouble is the hammer digs mercilessly into my belly. I've not been able to find a holster to accommodate this mode of carry, although I have been in contact with N82 tactical inquiring about the possibility of using one of their IWB holsters manufactured for a large semi-auto (specifically the Glock 21 in their original series) to carry the gun. It would work. I've not gotten around to getting the holster yet. I bought one of their original series IWB holsters for my LCR and find that it does marvelously for concealing IWB when I am not carrying it in a coat pocket.
Keep us posted. I'd like to hear what your solution is.