Ok, so I know this isn't really worthy of a blog posting, but nonetheless I'm rather pleased with myself. I have wanted to do this for some time.
Start with ugly wingback chair, ugly green upholstery fabric, completely riddled by cats.
The chair now, after about a week of measuring and sewing and probably 500 trips up and down the stairs to the sewing machine.
The slipcover fits like a glove and looks like upholstery, if I do say so myself. Lots of piping to give it detail.
Hooray! Now to do the second chair, should be much easier the second time around.