EK All Eras "Button Hole Orders"

[Long Thrust VI]

Gentlemen:

Please provide information as to why ribbons of the Iron Cross 2nd Class, & certain other decorations (i.e. Ostfront Medaille), were traditionally worn on the tunic's second button hole rather than displayed on a "rack" over the left breast pocket as are other ribbons. Is Germany the only nation to adopt this tradition? When & where did this practice originate? Thank you.

Regards,

John