Try Drake's, Exquisite Trimmings or Hanger Project. One of them might have it.
I have this one too. As TP said, the great thing about these is that you can emphasise one colour over another with the fold if you want to. And these wool/silk ones I love in general because they make such a nice easy puff. They take up a bit of room in the pocket, but it's worth it.
As for the summer/winter thing, I don't buy it - not because I live in endless summer, kind of, but because there are also tweedy country summer clothes and clean, glossy winter clothes. If you were wearing a Fresco sports jacket in August, a lumpy grenadine tie and coarse linen trousers, the texture of this square would be just as perfect as it is with a flannel suit and a challis in January. I think colours and textures are much more important than whether it's wool or silk.....so....
...here we differ, sir! Who says textures aren't allowed in summer? Or indeed on a bright sunny winter day. It's a cheerful colour for a cheerful look, it just needs the right accompaniments, and those don't have to be 20oz tweed and galoshes. Actually, probably better not. Air force blue hopsack blazer and chinos I'm feeling, with a checked shirt for interest, and a thin dark cotton PS?
Awful shirts, awful ties, a few worth saving of each but probably quicker to burn the house down.
Seriously though, as the work and lifestyle demands would suggest, the casual cords/chinos etc. are a nice selection for purpose, most of the more lurid shirts probably work well with some of those and a neutral jacket (no tie), and the occasional suits look pretty unobjectionable from here. With view to academic prestige, some lovely Pingson-esque tweedage and ties are the medium term goal, perhaps with a dose of Flying Monkey-madness for fun. PS's also seem like a lot of volume but little clarity.
But step number one - and this is a genuine emergency for attention right now:
DAMN YOU NEED SOME SHOOZ MAN!
Give me a budget and the size of your best-fitting shoes. I will give you five pairs to complete your basics. This is pretty much my favourite subject. :)
P.S. Nobody ever shows their socks. Good socks are the privilege of a gentleman. Let us think on that too.