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IF FALL’S MUSEUM fashion exhibitions put you in the mood for a shopping spree, you won’t have to go far to flex your Amex. The institutions’ gift shops have been stepping up their game after the success of shows like the 2011 blockbuster “Alexander McQueen: Savage Beauty” at New York’s Metropolitan Museum. Beyond the usual T-shirts and coffee mugs, visitors can score limited-edition fashion pieces they can’t buy anywhere else.

“Dali & Schiaparelli” at the Salvador Dali Museum in St. Petersburg, Fla. (Oct. 18-Jan. 14)…