so long now i cant' use the most of backgrounds in wardobe... if i use u cant' see the avatar... i pay a lot for this stuff, and m' sad that i cant' use... always the same use is boring... i know is not only me and really i hope that this problem will be fixed...
[flower=capper09]

You need to reposition the background. Drag it below all the other items you're wearing, and the avatar base, and everything will show correctly.
mmmh, i no understand, sorry... english is not easy for me... u say i should dress up first and use the BG as last one over all items? or use as first?
[flower=capper09]

When you open the wardrobe; there's a list of the items you are wearing on the left side of the screen. Next to the items is shown: + X ? If you click on the + and keep the mouse button pressed, you can move an item to a different position in the list. Click the + for the background and move it all the way to the bottom of the list. That should make it go behind everything else.
Take your background item, use the icon with the four arrows beside it (far left), click, drag beneath your base layer. I hope that helps. :3

Did any of the above suggestions help? You should be able to layer the background behind your avatar in the wardrobe.
sorry that i answer so late, to much work in RL...
so i follow the steps u say and may u can see what change... for me is not showing the face, left site arm and the breast. it was interesting to see that step by step i can see more from my ava, start with earrings and end with legs, but the rest i miss.. imgur no load up, so i hope this pic works. tysoomuch for the kindly answer and u'r patience... ;)
-- i don't know how to put the pic from my compu here that u can see... grrr...
[flower=capper09]

You see the box in your screenshot that says "base" ?
Drag and drop the background below that, using the little + symbol with arrows on it
-- yes, before it was up, now i drag it down, but... fft... hard job... may is up to the BG ? that not all of them work?
[flower=capper09]

You have to put it under the layer that says "base"
In your screenshot, it's under all the other items but above your "base" but it needs to go under that too (and if you want your default face to show up, like your nose, you need to move those above the base using the little + sign)
[edit]
This is what my item list looks like for my current HA
Where the arrow is, that's where your background item needs to be (and if you want your nose to show up, it needs to be above the base too like mine is)
-- yeah... jackpot.. g... i missunderstand, i think i can just move the things up, and the 4 things down... but i can move all to all place, is working... jeronimo... m' sooo happy... since so many months i was sad that i can't use... what a great gift... tytytytyt....
how cool and soo easy... u see, english is differend if u come from the jungle...
[flower=capper09]
