Little things mean a lot

So, I saw this:

and it reminded me of one of my favorite bits of Douglas Adams's writing, from Dirk Gently's Holistic Detective Agency.  The eponymous hero is helping his client and friend remember an encounter with a woman. Dirk tells him:

'She was wearing a dark blue cotton velvet dress gathered to a dropped waist. It had raglan sleeves gathered to the cuffs, a white Peter Pan collar and six small pearl buttons down the front - the third one down had a small thread hanging off it. She had long dark hair pulled back with a red butterfly hairgrip.'

'If you're going to tell me you know all that from looking at a scuff mark on my shoes, like Sherlock Holmes, then I'm afraid I don't believe you.'

'No, no,' said Dirk, 'it's much simpler than that. You told me yourself under hypnosis.'

Richard shook his head. 'Not true,' he said, 'I don't even know what a Peter Pan collar is.'

'But I do and you described it to me perfectly accurately.

Sublime.