First I unpicked one of the pant legs with a seam ripper, just enough to where I could tell it would be enough fabric for my pillow form. (which I got at savers for $2.99.) Then I cut the top of the pant leg off so I had a rectangle of fabric as you see in the above left picture. Then I folded the fabric over the pillow inside-out like you see in the above right photo, and again in the photo below. I wanted to make a flap so that I could easily get the pillow in and out since it's such a bright fabric and I might just use it for spring and summer.
Then I pinned the fabric around the pillow and slipped the pillow out. Then I sewed around the circle shape I had created with pins. This was hard for me to keep the straight lines, hence a kind of lumpy end result but it's nothing I can't fix... eventually haha! Then after I sewed I turned it back right-side out and slipped my pillow in! It was quick and easy, I just need a little more practice on my circle sewing.
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