Perhaps one of our older American friends might be able to shed some light?

I shall indeed be preachin' the word, accordin' to the Lord which is called Ahvy...

Mentioned in Big John's conversation with JS.  Austin's.  The overcoat I have someone described as looking like a dressing gown (the odd flecking).  I still know no more.

Ah...!

Esquire, June 1960.  TVs 'Peter Gunn' wearing Don Richards.  Bit of Googling around, and someone asking much the same question on another forum.

This is a message John Simons just sent to me on the subject of Don Richards :

"i first came across DR suits when i worked for Austins around 1957 - very ivy a California
brand "TOP OF THE RANGE" 39gns  (own make 25gns) i could not buy one too expensive for a
working class IVY BOY i went there last week to  finally buy one but to my surprise the shop had closed A DREAM HA HA 

AUSTINS was a magical spot in 55 -59 hallowed turf i remember as yesterday i would stare
up at the upper right hand part of the window where the DR suits were displayed yearning the nearest i ever got  to meditation"

Fantastic to hear from JS. I'm going to call myself an Ivy Boy from now on. Who's to stop me?

Some vintage ads to be seen online.

I still find that bit of information from The Guv'Nor a delight to read (on an overcast afternoon, coffee to hand, Jelly Roll Morton playing in the background for that authentic Woody/Dave Frishberg 'mouldy fygge' vibe). 
I made the mistake of sporting that overcoat at a Glaswegian funeral.  A good many heads were turned in my direction. 
'Refining my tastes', I gave it away to a charity shop in Hockley, Nottingham.  Silly of me really.  But subtle it was not and might well have been seen on the back of some dude strolling down Central Avenue in search of Wardell Gray and that ten spot that was owing.

Then we have 'Marc Richards' - any relation? - a kind of Eisenhower jacket.  That would have appealed to me fifteen or twenty years ago.
Another Ebay offering.