The first thing I EVER sewed was this pillow (below). This was before I had a sewing machine so the whole thing was hand sewn. It's not washable because it's just the case and the stuffing. I was AMATEUR, and I didn't even know what I was doing really.
I decided that since I have now got a sewing machine, I would go a bit further for this new pillow and make one with a removable slip cover so it would be washable.
First, I laid out a fat quarter I had onto the fabric I wanted to use for the inner cushion. I used a very old sheet but you could use anything. Keep it light coloured though, so it doesn't show through your cover.
Time to sew! Lay your inner (white) fat quarter on the table and fold it in half, right sides together, along the longest edge.
Then, STUFF IT! Fluff the stuffing around until the pillow has no big lumps in.
Once you're satisfied with the amount of stuffing (remember, stuffing flattens over time. So don't jam it full, but make sure there's a decent amount in there) sew the open end up. It doesn't matter if this doesn't look too neat - this is the inner pillow and it's going to be covered.
You have your inner pillow made!
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