Lyric discussion by Karnenyen 

While Hell's Angels do not wear "halos", they do wear "colours", tend to call each other "brother", are usually surrounded by "wine and women, song a plenty", and refer to their individual club as a "chapter".
A simple play on words. I hope this removes any doubt as to what this song is actually about.

@Karnenyen 100% from the start its about the Hell's Angels, We came across the west sea, is the origins of the HA and this will likely explaining Suzies saloons origins and the Amsterdam chapter's origins, the sea to the west.

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