I would never recommend anyone carry a Glock hot without a holster. For my own purposes it works. But if no round is chambered it doesn't matter where you put it or what it's in from a safety standpoint.

“When Tyranny becomes Law, Rebellion becomes Duty”

Colossians 3:17 (New King James Version)
"And whatever you do in word or deed, do all in the name of the Lord Jesus, giving thanks to God the Father through Him."