If anyone is deserving of the name of "Modfather" (that is, other than Paul Weller), then I think Steve is them. In fact, Weller has always said that the Small Faces were his mod inspiration - so much so that he feels Steve ought to be re-named The Modfather. So perhaps Weller is the Modfather, but Steve Marriott is the Grand Modfather. Or something.
Anyway in the original picture, I think his shirt is actually blue with a golden-yellow collar, which explains the contrast difference here (a combo well-worth trying on iTailor, thanks for reminding me). Along with this, he also wore a brown/khaki suit on the original cover of the first album (which is reproduced below).
To be fair, I could take or leave the suit, but the glasses were (and still are) cooler than anything I'd seen before. They made the piece.
I mention this not just because of the Steve Marriott connection (and because I haven't said anything about the Small Faces for quite a while) but because while I was browsing the other day on Atom Retro and found that they are actually selling the very same shades worn in that pic. These are truly incredible days we live in.