What's that? All gas and gaiters

From Jeeves in the Morning by P.G. Wodehouse.

Wooster refers at one point to "everything is once more gas and gaiters" to mean that everything is in good shape. Still, where did the term come from. When I lived in England in the sixties there was a TV show starring Derek Nimmo as a clergyman and titled "All Gas and Gaiters."

Michael Quinion explains fully here. The origin is in Dickens:

But the original is in Charles Dickens's Nicholas Nickleby of 1839, in which a mad old gentleman who has been paying his addresses to Mrs Nickleby arrives precipitously down the chimney of an upstairs chamber dressed only in his underwear. Then Miss La Creevy comes into the room, whom the old man immediately mistakes for Mrs Nickleby:

"Aha!" cried the old gentleman, folding his hands, and squeezing them with great force against each other. "I see her now; I see her now! My love, my life, my bride, my peerless beauty. She is come at last - at last - and all is gas and gaiters!"

Further:

Despite its being nonsense (or possibly because it was), all is gas and gaiters became a well-known interjection. The original sense - as you will realise - was of a most satisfactory state of affairs. This is how nineteenth-century speakers used it and also clearly what Wodehouse meant by it. But another sense grew up in the twentieth century in which gaiters referred to the senior clergy - such as bishops and archbishops - because of their traditional dress that included those garments, and gas alluded to their supposedly meaningless eloquence. So all gas and gaiters has come to mean mere verbiage.