Background: Backlund was born in Princeton, Minnesota, in 1949. During his freshman year, Backlund was an All-American in both football and wrestling (191 lb [87 kg], finishing third) while at Waldorf Junior College in Forest City, Iowa. During his sophomore campaign, Backlund focused on wrestling and once again earned All American Honors (190 lb [86 kg] and national runner-up). Backlund was an amateur wrestler at North Dakota State University, winning the Division II NCAA Championship at 190 pounds in 1971.
Context: After having been popular with the fans from early on, in the final months of his title reign, Backlund changed his image, cutting his moppish hair into a crewcut, wearing amateur wrestling singlets and losing muscle mass and definition. Fans seemingly grew weary of this "Howdy Doody" character (as The Grand Wizard had dubbed him). In 1983, he was voted the Wrestling Observer Newsletter's Most Overrated Wrestler. Vincent K. McMahon, who had bought the WWF from his father, wanted to put the title on the more charismatic and muscular Hulk Hogan. McMahon initially suggested Backlund to turn heel and lose to Hogan, but when Backlund refused, a transitional champion became necessary between Backlund and Hogan. Backlund sustained a (kayfabe) injury when The Iron Sheik assaulted him with his Persian clubs and on December 26, 1983, Backlund lost the title to Sheik when Backlund's manager, Arnold Skaaland, threw in the towel while Backlund was locked in the camel clutch.  Due to Backlund's (kayfabe) injury, Hogan took over Backlund's rematch and became the new WWF World Heavyweight Champion. However, this was a television storyline only; Backlund wrestled The Iron Sheik at least three times for the title, all at non-televised house shows (including once at the Boston Garden, winning by disqualification), and also wrestled The Magnificent Muraco for the Intercontinental Heavyweight Championship, also at a non-televised house show.  Backlund continued to work for the WWF for a while after the title change, but did not receive another title shot for the WWF World Heavyweight Championship after Hogan's victory. On August 4, 1984, Backlund defeated Salvatore Bellomo in his last WWF match for 8 years.
Question: What was his image change?

Answer:
cutting his moppish hair into a crewcut, wearing amateur wrestling singlets and losing muscle mass and definition.