The word “robe” is the derivative word, originally meaning the spoils of robbery, e.g. a stolen garment. It has only meant a specific kind of long loose garment for hundreds of years.
The English words “rip”, “reave”, “bereave” also come from the same origin.
The word “rob” comes from a proto-indo-european root meaning to “tear” or “strip”, and has apparently been used in the modern sense of taking things by force for thousands of years, https://en.wiktionary.org/wiki/Reconstruction:Proto-Indo-Eur... https://en.wiktionary.org/wiki/Reconstruction:Proto-Germanic...
The word “robe” is the derivative word, originally meaning the spoils of robbery, e.g. a stolen garment. It has only meant a specific kind of long loose garment for hundreds of years.
The English words “rip”, “reave”, “bereave” also come from the same origin.