Caldrail, just a few comments on your post:
Augustus would have been keen to avoid any accusation of becoming a king...
I agree, and I think that a main reason for rejecting thge proposed title of "Romulus" - which had been the name of the first king of Rome. (I must admit I have often wondered whether "Romulus" was anciently a title rather than a name, as the first king also appears to have been called (and deified as) Quirinius.)
I notice that he kept a less fancy wardrobe than later emperors too.
Where do you draw this comment from? I think he was relatively spartan and keen to wear homespun; but I do not doubt that he also wore triumphal gear when appropriate. Much of the time he would have been entitled to wear the toga praetexta as Consul, anyway. But as there was no precedent (except Caesar the Dictator) to follow, he presumably would simply have followed the approach of previous Principes Senatus.
He certainly permitted honours to be shown above the front door of his domus, and was not modest either in his self-written epitaph, or the other public honours he accepted.
Did Augustus think of himself as an emperor? No I don't think he did.
Here I would entirely disagree with you. By assuming the honorific "imperator" into his actual name, he clearly did see himself as such. He was also "son of the god" (divi filii). Octavian - the blood-stained, inconstant, ambitious, self-conscious, machiavellian teenager, who appeared in Rome in 44BC, in no way saw himself as an ordinary joe. He was eager to claim the full ame of his adoptive father and use it - he knew its power.
It was only Augustus, the victor of Actium, eager to throw off his evil reputation as gangster and murderer, who had sufficient auctoritas and dignitas to practice a sort of inverse snobbery. The less i claim, the more modest i seem, the more i am acclaimed, the more power i have.
From first to last, Augustus was the among the most ruthless, ambitious, self-aware, focused and manipulative politicians in history. Less was more with him towards the end, but he was an actor first to last.
Two more modern examples. Napoleon I - note how the simple grey redingcote and unadorned black bicorne, with the relatively modest dark green coat of the undress of a mere Colonel of the Chasseurs a Cheval of the Guard, made the Emperor stand out against the gold embroidery and swans feathers of his marshals, or the overblown flamboyance of Murat.
Similarly, Goering's white Reichsmarschall's outfits, Himmler's black and silver SS uniform, or Ribbentrop's diplomatic gear, were an effective backdrop for the Fuehrer's simple brown party uniform, of the almost anonymous grey jacket and black trousers he war as Commander in Chief of the Wehrmacht.
Augustus would have been taught no lessons by them.
Now, if you want an example of a TRUELY simple man, consider Tiberius...
Phil