I used to have a homemade neck seal that I wore under my shirt, but now I have a standard issue Anovos neck seal that came with the kit. Today I was suiting up for a troop and I put it on over my shirt. Problem was it flared out around the edges of the pecs and was actually falling over the top of the back armor, so I tucked it in under my shirt like the homemade one I had before. Question is, How is it supposed to go, Underneath the shirt or over it?