Geralt can change his look anywhere in The Witcher 3: Wild Hunt

Image credit: Free Transmog Anywhere - All Looks Unlocked by ripandtear21 via Nexus Mods.
Geralt's best armor doesn't always match the look you want for the next contract. Free Transmog Anywhere moves The Witcher 3: Wild Hunt - Remastered's Reforge system into the main menu, removes its crown cost and makes armor and weapon appearances available without first collecting the corresponding gear. The equipped item's stats and set bonuses remain unchanged.
There's a gentler option for players who enjoy earning each new look: Found Looks Only keeps appearance unlocks tied to discovery. Both versions include favorites and filters. They require the PC Remastered release with Reforge, however, and won't work on older branches. Fashion freedom has a version requirement.