I've used a belt from Rafter S Gunleather and love it. It's 1 1/2" and tapers to 1 1/4". I've found that it's great for my little overhang when bending over. Being that your son is more slender, he'd probably do fine with a 1 1/2 or 1 1/4" belt. I'd go for 1 1/4" as most belt loops are kinda snug with my belt. Here's a pic of my custom shark belt/holster rig.....very nice and at about $80 for the belt, the price can't be beat for custom work. I did pick up a Galco 1 1/4" today for about $50ish and like it as well...all depends on what you want to do for him.
![Image](http://i20.photobucket.com/albums/b227/age_ranger/DSC07210.jpg)