A tatterdemalion is a chap (or chappess) whose clothes are tattered and torn. It is the same as a tatter-wallop, a ragabash, or a flabergudgion; and, given the threadbare state of modern fashion, it is an eminently useful word.
Tatterdemalion should even be immediately comprehensible to the uninitiated because everybody knows what tatter means, and the demalion bit was never anything more than a linguistic fascinator.
Tatterdemalion is a lovely word with a suggestion of dandelions towards the end (although it is pronounced with all the stress on the may of malion).
More wonderfully still, there are spin off words: tatterdemalionism and tatterdemalionry. This latter word means all tatterdemalions. So, for example:
The tatterdemalionry of Shoreditch cannot endure the glory of my silk scarf.
Tell me that's not a useful phrase.
Dress-down Friday at Inky Fool Mansions