Epic game's anti cheat client is pretty accurate, and I haven't ever seen a false positive get somebody banned. The issue is that if you used mods that changes skins, they technically change internal files and would warrant a ban.
The only time I've ever seen one guy get unbanned is when he got banned for changing his Mac address, which he argued doesn't make him a cheater and he questioned why this would get him banned. It went down to him nearly filing a legal dispute because of the thousands of dollars he spent on developing and experimenting with Unreal Engine.