You can visit your own tent in Monster Hunter Wilds any time during your playthrough to change your look. Simply head to the tent and select "Equipment Appearance" from the Appearance Menu.

The guide explains how to change your appearance and use edit vouchers later in Monster Hunter Wilds, as well as make smaller tweaks without them.

How to change armor color and pigments in Monster Hunter Wilds is a fairly simple process, though it's one that you can go through most of the game without realizing how it works.