sewplease

I know I'm making too big of a deal out of this, but it's bugging me. I made a Take 5 quilt for a great nephew, and added a narrow one inch border with an outer border that's 4 inches, which is the width of the pieces making up the block. I thought I would use fleece for the backing, but the top is about an inch too wide on the sides...plus I will need to use a thin batting to keep the backing from showing through. Here are my questions - should I cut an inch off all the way around to keep it square (I'm concerned that the outer border will look too narrow then), or just use some regular fabric for the backing?

This was supposed to be a quick easy thing and it's been laying around since last summer!

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