The perfect dress is an integral part of the wedding for many women, and for Miranda Lambert, who recently said "I do" to her country counterpart Blake Shelton, her perfect dress was especially special -- because it was her mom's.

Lambert-Shelton, cover couple of PEOPLE Country's new issue, walked down the aisle in the same dress that her mother, Bev, wore when she married over 30 years ago, back in 1979. "It was a very tearful moment the day we first tried it on," Bev tells PEOPLE of the day her daughter found her dress. "She’s like, ‘I’m not even going to try another dress on. This is it Mom. There’s no other dress that would fit me better or mean more to me than this dress.'"

Lambert brought the dress up to speed with a few small alterations, like adding a train to the back in the same fabric of the dress. Otherwise, her good luck charm was a perfect fit.

"The first time I heard her talking about it, she said, ‘My mom and dad have had a great long marriage and it must have been good luck for them, so I want to start my marriage wearing the same dress my mom had on,’" says Kathy Best, Lambert's wedding planner and publicist, of the chosen one. "It was all about the lasting love her parents had, and that was very important to her."

"It was perfect,” Best adds. "And [Miranda] was just beautiful."

Watch the Miranda Lambert 'Famous in a Small Town' Video