Seems like it might be a bit more comfortable than the Kramer Confident Shirt (Since It's All cotton) & probably a little quicker to draw from. I found a "write up" on it also but, I have not tried it. It's only priced at $27.00 (Fairly Inexpensive)
Here are the links and you can decide if it might work out for you.
To Read The GunBlast Article On The Kangaroo Click Here
The Kangaroo Web Page Click Here
All Photo Credit To Gunblast.com their link is posted in this thread.