Exactly how was the jump case worn and what is the loop for? Any vintage pics?

[HDSledge]

How about this look?

Attachment 86706

My first impression is that the advertiser should dump the male models and get some regular guys to show off the cases. They certainly look ready for the hunt or range time eh? Or... The cased rifles make for the perfect accessory for a night out on the town hunting cougars?