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I also play musical instruments in church. The most recent event was with a bell choir where the dress is a white shirt and black pants. I play the lower (larger) bells and often hold them to at least shoulder height, exposing most of my torso. There is a constant pull of my shirt at the belt line in back - which is partially turned toward most of the congregation.

I use this.
http://www.kangaroocarry.com/
I carry a Sig P250 Compact which is similar to your carry piece. Even with all the constant jostling about, I never have a problem

It is also pretty easy to protect the gun from detection in the hugging process. I just keep my left arm close to my body. I have a spare mag on the other side and it has never been detected either.

Not everyone likes the feel of the Kangaroo but I don't mind it. I'm much more calm wearing it than I would be my IWB.