Slip covers for sofas and arms chairs

[StaffieZola]

Has anyone bought slipcovers for their sofa and chairs?
I don't mean those thin old fashioned nylon ones but something with a thick texture.
There are lots on line , different companies , but it's confusing.
And to cover a 3 piece suite can cost a few hundred pounds.
So I want to make the right choice.
Anyone recommend any brand or company they have used?
I should add that I don't want to buy from Plumbs as they like to do a home visit, measure up etc...
I prefer a simpler buying method.
Any recommendations ?