I knew I might be a little over my head on this one but, I totally took my time and referred to several other blogs on the subject of making your own slip covers. I didn't use any one particular tutorial, they were all basically the same.
My couch is "L" shaped and 18' long! So there just aren't any pre-made covers available that would fit it, or I would have gladly invested in them. If you think that a few of these pictures are confusing, just picture me trying to figure out what I was doing without a pattern!
I pre-washed the canvas then, tuck, cut, pin, cross your fingers!
This is a close up of the old and new fabric. 
We bought this couch before we had kids and four cats so,my household is now too busy to live with out a couch cover. I found it too challenging to keep my off white couch clean. But the couch has good "bones" so I didn't want to get rid of it.
By some miracle, the humongous slip cover turned out pretty well, I think. I'm really glad now that I didn't spend a lot of money on a new couch or expensive pre-made slip covers. Sometimes it pays off to try something new.
The fabric is surprisingly soft, yet durable. And I like the color a lot.
It now looks and feels more casual and cozy.
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