I know this is a stupid question but how do I preview a clothing item with my avatar? Not the normal preview but showing what you are wearing as well.

You go into the wardrobe. If you don't have the item hit "All items" under visibility. Type the item name in the search box Try it on! (Mind the filters, if it's a CW, make sure "Show all" or "CW only" is marked on the right)

You'd have to do it through the wardrobe. Change the visibility to All Items and search for the full/partial name of the item you want to see with the rest of your outfit

Thank you both so much!