The previous owner, who lived to be a bit over a century old, ran an accounting business with her husband. Which is why I’ve found a scattering of what are surely pencil marks on an otherwise very well-kept suit. The most noticeable one is on the left front side of the jacket. An appropriate expert could probably deal with this–or you might want to preserve and enjoy the provenance.
60s Peach Dress Jacket set
60s Peach Dress Jacket set (saved image)