How can I show up my worn items under my avatar on profile?

If you have the HA section up, then you can go to your profile and click the "edit your profile" link at the top of the page, click on the pencil and paper edit icon on the avatar section, and there should be an option there to check a box for show clothing or show worn items or something like that. Check the box and save your changes and that should do it.

I got it, thank you so much :)