is there an avatar maker so you can build a wishlist?

In the regular wardrobe on site, if you uncheck the box that says "only show items you own" you can see every wearable item that exists. You can then choose from one of the dropdowns to show all items, only CWs or only non-CW items to further narrow your search.

You can try on and combine any existing items to make avatars and put outfits together and save them, although you'll only be able to wear outfits with items that you actually own.

If you hover over items that you don't own, there will be an option to search shops for the item. On the shop search page, you can add the item to your wishlist if you want.

There used to be some off-site avatar maker sort of things, but I think most of them either don't exist anymore or haven't been updated. I think there's not as much of a need for an off-site one now since the current version of the wardrobe has been updated pretty well.