Hi!
The Dream Avatar Creator is only available to people who have
purchased Mennies. However, access never expires, so it's a small one-time fee for access, if you are interested in paying for it. If not, any singular item can be tried on by searching for it in the
marketplace, and all shop items can likewise be previewed in the marketplace or in the store they're sold at. Plenty of users would also be willing to put together a quick dream avatar for you if you had a specific combination in mind. :)
I hope that answers your question! If you have any further questions, feel free to ask. And welcome to Menewsha! :)