Kaylee does not celebrate Mardi Gras.
In Soviet Russia, however, Mardi Gras is apparently celebrating her. She is wearing a
yak hat* and a few strands of purple and gold beads.
After four-plus years in the bar, sometimes you just have to roll with these things. Or laissez les bons temps rouler. Whatever. She's got alcohol. All is well.
*yaks are totally part of Mardi Gras. don't be a hater.