The slip cover is quite cute. It would fit a very oversized wingback well. 
As it is, my wingback is medium size, I would guess. It takes some tucking time to make it appear as though it’s not a sheet thrown over a chair it’s so roomy, but it looks pretty boho loose like this.
The material is quite good and thick and VERY white! Whiter than I prefer. But that would be simple enough to change.
If you like this oversized messy look, this might just be for you!