Technically, "Christmas Day" appears to be the B-side of Miss Chain & The Broken Heels' "Flow", which has a nice retro sound, even if I'm not hearing any holiday references in the lyrics. Shantih Shantih is an all-female band and they're actually from Atlanta (Georgia, not Italy). And, aside from the song itself, my favorite thing about it is that they designated it "Reggae" on Soundcloud. You can follow the band via Facebook.
Just for the heck of it, let's listen to the title track from Shantih Shantih's latest album, "Winter In September".