Based on previous auction results, a signed Elvis Presley scarf can potentially sell for thousands to tens of thousands of dollars. For instance, in May 2019, a scarf worn by Elvis Presley in the 1960 movie "G.I. Blues" was sold for $25,000 at an auction held by Julien's Auctions in New York.
Remember, the actual value realized at auction may differ from the estimated value and depend on the specific characteristics of the scarf and the interests of the bidders participating in the auction.