So I don't know if there is a special way to be doing this, but there are certain background wearables that won't go behind the body of the basic HA. This leaves my HA's body completely covered by the background even though I can layer other items on top of the background.

Here's what I mean- Example of Correctly Layered Background: Permanence of Recollection Souvenir Print Example of Incorrectly Layered Background: The Flowering Collectible Poster

(Sorry, I don't know how to insert the items into the post.)

Hopefully I explained that well enough, any help would be appreciated!!

Just drag the background under the "base" layer in the item list on the left

I think explained it, but if you wanted information on how to insert items into posts, you just have to use some sCode. The one you would use for items is

Ah wonderful! Thank you so much!