Odds are you may be tending to squarely face your target. Try this- (for right handers) Face target, and then pivot 45 degrees to your right. Spread your feet about shoulder width apart. Now, WITHOUT MOVING YOUR FEET- turn your body back towards target. (For those that have had the attentions of a Drill Sgt, you are making a half left face) Pocket becomes more apparent when angle of arm to chest is less than 90 degrees. You NOW also have right foot about a half step behind the left, meaning your weight is evenly balanced.
I watch a LOT of shooters stand facing target squarely, feet side by side, and when you raise rifle or pistol, NOW your shoulders have moved back, hips forward to balance weight of arms, and you are off balance.
If you raise right arm, hold it out at 90 to the front, take left hand, feel for pocket, and while holding left hand there, move extended right hand to the left- feel the pocket increase?