This is the wardrobe mechanic, this is how you'll be able to access your outfits. You have seen an earlier version on the demo, but the one in the game will work in a similar way to zelda breath of the wild, where you can buy more than one of each since they can be tinted, you will be able to change the color of some pieces by providing materials.
You can also see a few more pieces worn by Alfie. Since i'm making multiple games i thought it would be cool to share some outfits from other games. So you might be able to use Montse's clothes from ROAG for example. Not all outfits obviously, but some. Here is Alfie wearing some outfit pieces from Briselle of ROAG.