Alan Jackson gave fans at his recent sold-out Country Music Hall of Fame and Museum artist-in-residence show a surprise treat, performing the encore in throwback threads!

Jackson concluded his residency by mixing up the setlist during the second of two sold-out shows, reminiscing with the crowd about his lengthy and impressive career, his family life and his first years in Music City throughout the performance.

'Gone Country,' 'Rose Colored Glasses,' 'I'd Love You All Over Again,' 'Wanted,' 'Midnight in Montgomery,' 'Chasin' That Neon Rainbow,' 'Remember When,' 'Chattahoochie' ... the legend hit them all, but fans really went wild when he called on Alan Jackson from 25 years ago to close out the show!

Even Jackson's wife, Denise, was surprised when the singer strolled onto the stage for the encore sporting a full-on retro country look. Cutoff flannel shirt? Check! Jeans with holes? You got it. He even rocked a straw cowboy hat and mullet as he performed 'Mercury Blues, 'Dixie Highway' and 'Sissy's Song.'

Jackson's residency at CMHoF may be over, but his exhibit, Alan Jackson: 25 Years of Keepin' It Country, will run through March 2015. The country icon is the first artist to ever be both an artist-in-residence and have an exhibit honoring them at the same time.

Clearly, Jackson has still got it, and he'll take that swagger on the road when he kicks off his Keepin' It Country Tour in January. See dates here.

You Think You Know George Strait?