A jaunty angle

Today I accepted the fact that I cannot find my "looks stupid, but keeps you warm" woolly hat: it's lost in the house somewhere, but winter will be over before I stumble on it.

So, to prevent my ears falling off, I thought I'd head to Tiso to find a replacement. Nothing fancy, you understand - just a simple, black woollen hat.

But did they have such a thing? No, they did not.

Is there some Law of Shopping that says whenever you know EXACTLY what you want to buy, that thing will cease to exist?