I usually like having a level 2-3 (i think) tan because they're the closest to my actual skin color, but I haven't tanned recently as I've had pink hair for a while now and the way pink hair looks in the game doesn't look nice with a tan. And it's too easy to go too dark orz
That's very possible. I actually forgot about the tanning issue at first, until the next morning when I started the game and saw that my character had gotten a little darker.
I had a terrible tan about a week and a half in even though I was wearing a hat. (it was the DJ cap, which is weird since all the other caps prevent tans...) But since I switched to the N cap it started fading. I was also playing less during the daytime and more during the night.
I heard quitting when you're indoors helps speed up the tan fading, but not sure how accurate that is.