Purchased a jacket on eBay labeled as a blazer/sportcoat. Did I get an orphaned suit jacket?

Recently started shopping for a blazer/sportcoat for a wedding in the fall. Saw this Hart Schaeffner Marx jacket on eBay for an ok price, but now that I got it it seems the shoulders too padded for a blazer. Did I get an orphaned suit jacket? Anything I can do to use it, or should I open a message with the seller that they mislabeled the item?
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