You may think that multiple collars are a recent invention. In fact, they have been around for quite some time.
Greer Garson in ‘Random Harvest’ (1942). Source: thefoxling, Flickr.
NOM*d double shirt jacket (AW08)
NOM*d triple collar jacket from Danse Macabre (AW11)
Karen Walker bug-patterned peplum blouse from The American Girl (SS12) giving the illusion of a triple collar
Katy from Plume (310 George Street) wears the NOM*d Trooper Shirt from Spaced Out (AW13) with her own detachable collar
NOM*d Trooper Shirt collar detail with Company of Strangers ring necklace