A google lens search reveals several in black, navy, red, and white (like yours) on Etsy. Sellers are claiming 1970s, which seems appropriate.
A navy one on eBay (search item #266835271837) has a "Gilberti" tag instead of Sears.
That dress seems to be everywhere. It's been posted on these forums before I think. I found it once in black with red flowers but I don't think the tag was Sears, can't remember.
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