How do you get the rare skins?

Just keep playing to earn coins that you can spend on skins/outfits. For example, landing or landing on part of the slide gets you coins. You can also kick someone off of the slide and you get 10 coins for "kill." I think the easiest (but not too fun way) is to watch ads and get coins. Common skins are 300 coins, rare skins are 700 coins, and legendary skins are 1.5 coins. I hope this helps!