There are many pretty accessories that you can add to your custom memoji on the iPhone, but if you want to get into the Christmas spirit this year, you can wear your Memoji with a festive Santa hat.
CONNECTION: How to Use Animoji on the iPhone X, XS, and XR
To do this, all you have to do is edit and edit your own memoji by tapping the ellipses button when you click have the memoji enabled in iMessage. Then choose "Edit".
From there, go to the end of the adjustment process where you select the headgear. Scroll down a little and find the Christmas hat.
Scroll up and tap the color palette. Change the color to the color you think is the best choice (or a different color if you're a rebel), hit Done, and you're off to the races! The Christmas hat races. It's a big event at the North Pole.