I remember, back in the 70s, Americans digging Cadburys' chocolate.  Hershey bars etc. were still a rarity in England.  My father would bring me candy back from his Stateside trips (partly accounting for the current state of my gnashers). 
A dozen or so years ago, in a small town in Brittany I stayed in, a shop on the high street was specialising in 'Celtic' goods: everything from whisky to knitwear. 
There are Irish-themed bars in Paris. 
I started off with Loake, moved onto Grenson.  Found them simply too 'English' when indulging in full-on Ivy.

I wonder if Tootal scarves (and 'Sammy' and 'Duggie') are something of a 'grey area'. 
Our old poster The Beatnik was something of a devotee and he wasn't exactly 'Ivy League'.  Nor was he a 'Mod'. 
But, like Kangol, the name has become 'iconic' (ugh). 
You'd go into shops like 'Celia's' in Nottingham and there'd be baskets with scarves in them.  Usually cheap.  Tootal would sometimes appear. 
Not sure if they ever found American buyers, though.  I'll look into that.

Tootal
Kangol
Like Fred Perry, 'iconic' names: crossover, at least in the UK and Europe. 
Any others from the 60s that spring to mind? 
JS used to wear a nice green scarf at Russell Street; had Kangol advertising in the window he picked up at a boot sale somewhere. 
Spoiled for many by the likes of Oasis getting onto it.

My Total scarf is 100% silk but I think many were rayon

I have a made in USA Kangol flat cap but I don't think of it as Ivy. Perhaps another grey (gray) area?

Kangol hats I think of Samuel L. Jackson or various USA hip hop or rap artists. Not Ivy in my eyes but a cross over from UK to USA?

Just referring, on another thread, to a DW posters interest in Nik Cohn's 'Gentlemen' book.
It reminds me, slightly, of that odd period when teenage boys fancied looking like city gents, thus showing how clueless they were.  Where I grew up, we didn't know a city gent from a railway porter.  Yet we blinked over the covers of those lurid NEL paperbacks at hard nuts wearing Crombies with big shoes and coloured socks.  Who led that 'style'?  One tried to imitate it on little money - not successfully.  We mixed in 'Ruperts' with snide Crombies and shoes with wedges.  Bad.