Don't sweat the small stuff as we say in the States!
Exactly. Sorry but this thread reeks of 'insecure convert', as much as I like traditional clerical garb, Roman and the various Eastern kinds.
Looking a little at history: the RCs in the US, setting an example I've seen Orthodox priests follow, in 1884 at their Council of Baltimore decided the priestly church uniform would be cassock and biretta (like a skufia) but the street one a black suit and clerical collar, which I think the Anglicans invented. The Archdiocese of New York's priestly street uniform in the 1930s-1960s was that and a black fedora or homburg hat. Apparently Met. Philip has adopted a modified version of that. His call.
I understand in the late 1800s-early 1900s St Tikhon said priests in the US could wear suits and trim their beards, and legend has it there's a photo of him in a suit. (After reading the thread I think it could have been St Raphael.)
So many generations of Orthodox priests in America have looked like that, from St T's Russian dioceses/Metropolia/OCA where the older generation of priests look like RC priests, clean-shaven with black shirt/white-tab collar, to the Greek Orthodox; once at a Greek Orthodox gathering I met several older ones who all were clean-shaven and wore black suits with the Anglican white band collar all the way round the neck. Dressed just like conservative Episcopal priests.
Those who have nothing to prove aren't uptight about wearing civilian clothes off-duty, which seems the attitude in Europe.
I'd say if you know the priest, sure, ask for his blessing. It's just like when he's in uniform; he's usually not vested then either.