OPtions:
1. Don't wear poofy camo.
2. Something to flatten out poofy camo.
3. Ignore #1 and #2 and hit poofy camo.
If you use binos, a nice snug fitting bino harness can hold your clothes into your body better, or you could just get some camo that fits.
It actually COULD be a bit of a form issue if you shoot with a very closed stance......open it up a bit and suqare your shoulders a bit more to the target, but realistically you want to be able to shoot in any position from any angle and not have to worry about popping a jacket.
I saw my buddy Frank shoot at a chipshot doe at 15 yards and whack his Poofy coat.......he had a better chance of hitting that deer if he threw his bow at it.