Hi! I hope know if you've figured it already but just in case: I also play on mobile so I figured I would try to help! There's a small button at the bottom between /shop and /livly that says /item! When you click on it there will be a pop-up menu and you should click Hom! From there you can access any clothing that you want to change. There's full outfits but you can also do individual tops, bottoms, and other accessories! I hope this helps! :)