I have been practice carrying for about a month or so in my apartment, and at my parent's place. I have a Comp-Tac Shirt-Tucker holster from
www.comp-tac.com and I LOVE THAT HOLSTER.
First off, it's comfortable. So comfortable that I often forget that I'm carrying.
Second, it's VERY concealing. Even with office clothing, business casual, or anything... This is due to the ability to tuck in your shirt over the grip. With a not-too-tight tucking of the shirt (leave a little bagginess on both sides), it's almost impossible to tell I'm packing. My brother (a cop), and the rest of my family couldn't even tell. I then pointed it out to them, and they said they'd have never known. I recommend this holster for anyone who wants to carry ultra-concealed with this IWB holster. I'm not sure how it'd hold up to a wider-framed pistol (read: G22) than my single-stack, but I love the holster, and won't ever use another holster manufacturer if I can get one from Comp-Tac.
Their customer service is impeccable. If they don't have a holster compatible with your gun, email them, and they are likely to make a holster for you (though you'd have to make arrangements to ship them your gun).
Call them, or email them. I'm in no way affiliated with Comp-Tac, just a VERY satisfied customer (with regard to product quality, price, & customer service).