Although there are a number of high quality and professional concealable holsters and other gadgets on the market, I have always preferred to carry my weapon in the small of my back or simply concealed in a pocket. Note, I am by no means saying these are the ideal locations to carry a weapon, but rather unconventional locations that I have not only trained countless hours drawing from but have grown proficient with.
In addition to the small of my back and a number of jackets and other outerwear that provide hidden pockets and other concealable areas, I was led to BlackHawk's Operations Jacket.
Although the folks at BlackHawk do not promote their Warrior Wear Operations Jacket for covert operations, after months of use, I have found it to be one of the finest quality overt/covert jackets I have ever owned.
The Warrior Wear Jacket System consists of three jackets designed to be used separately or layered in combination with each other depending on the temperature, elements, and the wearer's need for insulation, ventilation, and wind or water resistance.
Although BlackHawk offers an outer shell that is designed to be worn over the operations jacket, myself and most of my colleagues who have worn the operations jacket agree, with its ability to provide both wind and water resistance, there is no real need to add additional layers as long as temperatures don't drop to the 20s and 30s.