I'm watching Baywatch season 5 episode 12.
C.J.: Well, if there can be aliens, why can't there be elves?
Matt: C.J., You've been a big help. Now I know what to get you for Christmas.
C.J.: Really? What?
Matt: Something in white canvas, has long sleeves and ties in the back.
I don't know the meaning of Matt's last sentence.
I would be grateful if someone helps me understand the sentence.