I do not know what the CCW regs are in Illinois.  A good source of info on the bewildering array of state laws is  
Packing.org . However, I have a hard time believing that any exposed holster would be considered "concealed"  anywhere. 
     I am in Utah. Here it is illegal to carry  
any firearm while bowhunting, or even to have one in your camp! One of the few exceptions is made for CCL holders, which was the main reason I obtained one.