My client's sweater had many holes in it. The picture below shows just one of the holey areas.
Before: holes at the wrist.
I used raspberry and gray yarns to both knit patches and do darns.
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After: a row of gray darns.
After: a raspberry colored darn.
After: three raspberry patches and several darns.
After: a close up of a triangular patch that abuts a gray darn.